There is a marriage for Marguerite Gilwes to a Jeremiah Shea in 1851 Farnham
Her parents John Gilwes and Margaret Mullin so fits.I cannot find her birth though.
Also, in 1850 census for Cohoes, Albany, NY there is a Sarah A. Gilioee, age 22, born Canada so this would make her born about 1828 which matches with birth for Sarah in 1827 (you had typo of 1837) So possibly her.??
She is in household of Robert 29, and Bridget Berry - Bridget age 25, born Ireland - could she be a sister to Sarah?
I did not find any other Gilwee (or similar) names in NY.
But there is a James Gilwee death in 1916 Bloomington, McLean, Il and shows parents as John Gilwee born Ireland and Margaret Mullen born Ireland so seems to be another child for them.His death is also at Find a Grave with birth date shown as April 26, 1837 Canada
wife Ann Donnelly children: Margaret M. Gilwee Riegger 1871-1947 John Edmund Gilwee 1875-1947 Ann Gilwee Hall Bryant 1876-1947
odd that all the children shown as dying in 1947
I then looked for any other Gilwee entries in IL at Find a Grave and there is J.W. Gilwee born May 19, 1854 Albany, NY died Oct. 4, 1895 Bloomington, IL (so another connection to Albany so maybe Sarah above is right one)
There is also a William Gilwee born June 9, 1824 Ireland died April 22, 1908 Bloomington- husband of Mary Coffey children: James Patrick 1866 VT-1933 MO
William is not listed in IL death index as he died before it starts. Find a Grave does not show his parents names
Ahh - I may have found Margaret and Jeremiah - he is listed as Jerry They are listed in Cohoes, Albany, NY in 1860 Jerry 30, born Ireland Margaret 25 born Canada , John 8 born MA, and Mary 1/12 born NY
so again Albany, NY
I wasn't able to find them after 1860 though.
There is also a John Gilwee in 1880 census for Saint Louis, MO. He is born about 1835 Canada, single and a Doctor
and at Find a grave there is a John Gilwee, MD died 1904 Saint Louis and born 1835 Farnham Canada East so another possible child for John and Margaret
In 1900 census he is still in St Louis, MO, still single and living with him is a Sarah Gilwee, age 22, niece, born MO father born Ireland mother born Ireland
and Grace O Keefe, age 20, niece born IL father born Indiana mother born Canada Gertrude O Keefe, age 17, niece, born IL father born Indiana mother born Canada