My guess is, from the info you wrote, that the Margaret Brewer you mention, is indeed, the daughter of Benjamin Brewer:
Benjamin BrewerFamily Group Sheet
Subject: Benjamin Brewer1
Birth: 24 Apr 1755 Fayette county, Pennsylvania. ,2,3,4,5
Marriage: 18 Mar 1781 Fayette county, Pennsylvania.3,6,5
Death: 6 May 1834 Salem, Washington county, Indiana.2,4,5
Father: Benjamin Brewer (b. circa 1735, d. before 26 Oct 1778)
Mother: Mary w/o Benjamin Brewer Sr. (--?--) (, d. after 26 Oct 1778)
Spouse: Catherine Mellenger
Name-Marr: __ ___ ____ Brewer
Name-Var: __ ___ ____ Catherine Gertaut Brauer
Name-Var: __ ___ ____ Magdalena Brauer
Name-Var: __ ___ ____ Catherine Mellinger
Birth: 8 Mar 1758 Fayette county, Pennsylvania.2,6,5
Witness: 20 Jul 1798 Probate; John Mellenger and Philip Stimmel; South Huntingdon township, Westmoreland county, Pennsylvania.7,8
Death: 9 Dec 1839 Salem, Washington county, Indiana.2,6
Burial: after 9 Dec 1839 William Cooley Cemetery, Salem, Washington county, Indiana.6
Father: John Mellenger (b. circa 1738, d. before 20 Jul 1798)
Mother: Barbara wife of John Mellenger
Nine Known Children
F Margaretha Brewer9,9,9
Birth: __ ___ 1778 5
Birth: 23 Jul 1780 Westmoreland county, Pennsylvania.9
Baptism: 24 May 1781 Zion Church Lutheran and Reformed Church, East Huntington township, Westmoreland county, Pennsylvania.9
M Benjamin Brewer10,10,10
Birth: 15 Mar 1782 Westmoreland county, Pennsylvania.10
Baptism: 20 May 1782 Zion Church Lutheran and Reformed Church, East Huntington township, Westmoreland county, Pennsylvania.10
Birth: __ ___ 1792 Pennsylvania.5
Marriage: before __ ___ 1836 Rebecca w/o Benjamin Brewer
F Catharina Gertraut Brewer11,11,11
Name-Marr: __ ___ ____ Nuckles3
Birth: before 20 May 1782 11
Baptism: 20 May 1782 Zion Church Lutheran and Reformed Church, East Huntington township, Westmoreland county, Pennsylvania.11
Marriage: __ ___ ____ Charles Nuckles3
M William Brewer
Birth: __ ___ 1783 5
Marriage: __ ___ ____ Margaret Holmes3
M Samuel Brewer
Birth: __ ___ 1784 5
Son: 15 May 1797 Aaron Brewer; Fayette county, Pennsylvania.12
M Peter Brewer
Birth: __ ___ 1786 5
Son: Benjamin Peter Brewer
F Mary Brewer5,5,5
Birth: __ ___ 1788 5
M John Brewer
Birth: 11 Feb 1788 13,5
Daughter: __ ___ 1827 Mary Brewer; 14
Death: __ ___ 1863 13
Marriage: __ ___ ____ Elizabeth Cooley3
F Hannah Brewer
Name-Var: Hannah Jane Brewer
Name-Marr: __ ___ ____ Monical15
Birth: 26 Aug 1799 Indiana.5
Marriage: __ ___ 1814 Reverend George Washington Monical (b. 26 Feb 1793,); Nicholas, Kentucky.15,5
Son: 25 May 1823 George Washington Monical; Indiana.16
Death: 16 Feb 1874 Bible Grove, Illinois.16
Printed on: 11 Jul 2005
3788 Mahalo Circle
4 Hillside Place, Winsted, Connecticut 06098, (860)379-9310. Jenny Rasmusson. unknown record type.
Ancestral File. Family History Library, 47 North East Temple Street, Salt Lake City, Salt Lake, UT 84601.
Brewer on Ancestry.com. Online email@example.com<. [CD]>.
Connie S. "Email with Connie S.." E-mail message from firstname.lastname@example.org at unknown address. 7 feb 2001.
Greensburg, Pennsylvania, Westmoreland County Courthouse. unknown file number, WestmorelandCoPA Court Packets.
Iams Collection. FHL#1888849-52; 1888962-64; 1892350. Salt Lake City, UT: Filmed by the Genealogical Society of Utah, 1993 unknown roll.
Loveless, Richard William, 1942-1992. Records of the district of West Augusta, Ohio County, and Yohogania County, Virginia : District of West Augusta, minutes of the court (1775-1776), deeds (1775-1776); Ohio County, minutes of the court (1777-1780); Yohogania County, minutes of the court (1776-1780), wills 1776-1780)
. Columbus, Ohio: State University Printing Dept.,, 1970.
O'Brien, Sheri. Mellinger, "Sheri O'Brien on Internet." Listserve message to GenForum. 16 Feb 1998.
unknown author. Brewer Family, "Correspondence with Mary Brewer ." Listserve message to Brewer Genforum.
1. West AugustaCoOH Court Records recorded as Extract #8507
Richard William, 1942-1992 Loveless, compiler, Records of the district of West Augusta, Ohio County, and Yohogania County, Virginia : District of West Augusta, minutes of the court (1775-1776), deeds (1775-1776); Ohio County, minutes of the court (1777-1780); Yohogania County, minutes of the court (1776-1780), wills 1776-1780)
(Columbus, Ohio: State University Printing Dept.,, 1970)975 P2Á, , Brewer, Benjamin II 221,268
At court continued and held for Yohogania County October the 26th 1778
Inventory of the Estate of Jonathan Higgs deceased returned by the appraisers and Ordered to be Rec'd.
Inventory of the Estate of Benjaman Bruer deceas'd. Returned by the Appraisers and Ordered to be Recorded.
. Hereinafter cited as West Augusta Court Records.
2. Mellinger recorded as Extract #8374
Sheri O'Brien, "Sheri O'Brien on Internet," listserve message to GenForum, 16 Feb 1998. Printout dated 16 Feb 1998, Catherine[Mellinger] born March 8, 1758 died December 9, 1839 in Salem, Washington, IN. Married Benjamin Brewer who was born April 24, 1755 in Fayette Co., IN and died May 6, 1834 in Salem, Washington, IN.
Margaret, Peter, Samuel, William, Catherine, Mary, John, Benjamin Jr, Hannah.
. Hereinafter cited as O'Brien.
3. Brewer Family recorded as Extract #9276
Correspondence with Mary Brewerlistserve message to Brewer Genforum, unknown original date. Printout dated 5 Jan 2002, Benjamin BREWER was born 24 Apr 1755 in Fayette Co., PA and died 06 May 1834 Salem, Washington Co, IN. He married Catherine MELLENGER on 18 Mar 1781. Benjamin and Catherine's children were Hannah (m Rev George MONICAL), William (m Magaret HOLMES), Samuel, Peter, John (m Elizabeth COOLEY), Catherine (m Charles NUCKLES) and Benjamin.. Hereinafter cited as Brewer Genforum.
4. Connie S., recorded as Extract #9355:
Connie S., "Email with Connie S.," e-mail message from email@example.com (unknown address) to Jenny Rasmusson, 7 feb 2001, The information that I have about my Benjamin Brewer is that he was born in
4-24-1755 inFayette Co. PA and Married about 1781.Died May 6 1834 in
Salem, IN.He was a Revolutionary war veteran of Dutch descent.His
military unit was the Penn Militia.I only have the information about him
because one of his daughters married into one of my roots, the subject of a
family tree book (upside down).Her father was only mentioned because of
the tie to the revolutionary war.
. Hereinafter cited as "Connie S.".
5. Brewer recorded as Extract #9430
Brewer on Ancestry.com, online firstname.lastname@example.org, •Name: BENJAMIN BREWER
•Birth: 24 Apr 1755 in FAYETTE CO., IND.
•Death: 6 May 1834 in SALEM., WASHINGTON CO., IND.
Marriage 1 CATHERINE C. MELLINGER b: 8 Mar 1758 in PENN.
•Married: 18 Mar 1781
2.MARGARET BREWER b: 1778
3.WILLIAM BREWER b: 1782
4.SAMUEL BREWER b: 1784
5.PETER BREWER b: 1786
6.MARY BREWER b: 1788
7.JOHN BREWER b: 11 Feb 1788
8.BENJAMIN BREWER , JR. b: 1792 in PENN.
9.HANNAH JANE BREWER b: 26 Aug 1799 in INDIANA
•Name: CATHERINE C. MELLINGER
•Birth: 8 Mar 1758 in PENN.
•Death: 9 Dec 1839 in SALEM., WASHINGTON CO., IND.
Father: JOHN MELLINGER
Mother: BARBARA MELLINGER
. Hereinafter cited as Brewer on Ancestry.com.
6. Genealogy ANF recorded as Extract #1041
Church of Jesus Christ of Latter-Day Saints, compiler, "Ancestral File"; Ancestral File Family History Library, 47 North East Temple Street, Salt Lake City, Salt Lake, UT 84601. Hereinafter cited as "ANF".
7. WestmorelandCoPA Court Packets, Court Case Packets in Prothonotary Office -- Westmoreland County, Pennsylvania unknown file number, Westmoreland County Courthouse, Greensburg, Pennsylvania, [Numerous interrogatories]:
24 Aug 1831 a jury having been called [and found the following to be true]:
• Last will of John Mellinger dated 20 Jul 1798
• Warrant from Commonwealth of Pennsylvania to John Mellinger for 400acres on the waters of Jacobs Creek dated 20 Feb 1788
• Survey by deputy surveyor
• Michael Varner, a witness, testifies "I know the children of John Mellenger, decd, they are Philip Mellenger, Mary Isenhour, Catharene married to Benjamin Brewer and Elisabeth married to Isaac Stimmel
• Land was not included in division of estate of John Mellenger
• Divided later by amongst the children in 1803
. Hereinafter cited as Court Case Packets.
8. WashingtonCoPA Probate Iams recorded as Extract #8057
Iams Collection; FHL#1888849-52; 1888962-64; 1892350 (Salt Lake City, UT: Filmed by the Genealogical Society of Utah, 1993),Millinger/Mellinger p.49
John MillingerHuntington twp
July 20 1798
F - Apr 9 1802
2 Mary Shevelear
3 Catherine Brewer
4 Elizabeth Stimble
5 [nothing written]
son Philip & Isaac Stimble apptd.
. Hereinafter cited as Iams Collection.
9. EHuntingtonWESTPA Church Zion, recorded as #7943
Zion Church Lutheran and ReformedEast Huntington Township, Westmoreland County, Pennsylvania Parish Records 1778-1820, 15 May 1997, Paul Miller Ruff, 18 Fosterville RoadGreensburg, PA, p.6 M 348Margretha23 Jul 1780; 24 May 1781Benjamin Brauer and Catharina Gertaut; Georg Metzler and Anna Margaretha, Jenny Rasmusson.
10. EHuntingtonWESTPA Church Zion unknown record type, Jenny Rasmusson, 4 Hillside Place, Winsted, Connecticut 06098, (860)379-9310, p.8 M 424 Benjamin15 Mar 1782; 20 May 1782Benjamin Brauer and Cathariina Gertraut; Joh. Balthasar Duerr.
11. EHuntingtonWESTPA Church Zion unknown record type, Jenny Rasmusson, 4 Hillside Place, Winsted, Connecticut 06098, (860)379-9310, p.8 M 425 Catharina Gertraut no birthdate; 20 May 1782 [same day as brother Benjamin]Benjamin Brauer and Magdalena.
12. unknown author, Brewer Family in "Brewer Genforum," listserve message unknown original date, I have a Samuel Brewer who had a son, Aaron Brewer born 15 May 1797 in Fayette Co., PA. Do you know if my Samuel could be your Samuel? I don't know who Samuel's wife was or anymore information about him. He is where I am stumped. Samuel's son Aaron was buried in Douds, Iowa in 1862.
13. unknown author, Brewer Family in "Brewer Genforum," listserve message unknown original date, John Brewer 1788-1863 m. Elizabeth Cooley.
14. unknown author, Brewer Family in "Brewer Genforum," listserve message unknown original date, Elizabeth Brewer 1827-1900 m.George Paynter.
15. unknown author, Brewer Family in "Brewer Genforum," listserve message unknown original date, Hannah Brewer Married Rev. George Monical
Geroge Washington Monical M Hannah Simmons
Hatttie Monical m John Rude
Cora Rude m Thomas Murphy
Mary Murphy m Robert Schilke
(me) Constance Schilke m Richard Johnson
16. Brewer on Ancestry.com, online email@example.com, •Name: HANNAH JANE BREWER
•Birth: 26 Aug 1799 in INDIANA
•Death: 16 Feb 1874 in BIBLE GROVE, ILL
Father: BENJAMIN BREWER b: 24 Apr 1755 in FAYETTE CO., IND.
Mother: CATHERINE C. MELLINGER b: 8 Mar 1758 in PENN.
Marriage 1 GEORGE W. MONICAL b: 26 Feb 1793 in VIRGINIA
•Married: 1814 in NICHOLAS, KY.
1.GEORGE WASHINGTON MONICAL b: 25 May 1823 in INDIANA