Are you sure Caldonia's father was Isom?On the 1870 census, Washington, Dallas, MO there is a Isom Gibson, b. abt 1816 VA, listed with a daughter, Caladonia, age 9, b.AR.Isom's wife is Sarah, b.abt 1836 NC.Isham and Sarah are living in Sebastian Co., AR in 1860. Isom is in Newton Co., AR 1880 with wife Mary A.
On the 1870 Clark, Pope, AR census there is a Solomon Gipson, b.abt 1827 AL, listed with a daughter Caledonia A., age 9, b.AR.Per the 1880-1910 census that I looked at, Caldonia states her parents were born AL and KY.This Solomon's wife is Susan, b.abt 1828 KY.I would think that Solomon was the father of the Caldonia that you are researching as opposed to Isom due to the birth locations.There is a U.S. & International marriage record on Ancestry for a Solomon Gibson, b.1827 AL and a Susan Moor, b.1826 KY.The name is spelled Gibson/Gipson at different times.Solomon and Sarah are in Pope Co., AR 1860.Solomon(spelled Salaman) is in Howard Co., AR in 1880 as a widower.
Also on her husband, there seems to be two James Minyard's born 1857-1859 in Terre Noire, Clark, AR at the same time.Both mostly go by James.The one listed on the 1860 T.N.,Clark,AR census is the son of John(John William) Minyard and Jane(Nancy Jane Jones), was age 2.I noticed on the 1910 census he used the middle initial of M. I could not locate this James in 1870 and the sisters that are on the 1860 census are probably married by 1880 where his other siblings are living with him and Caldonia.
The second James was born abt 1859 and per the 1870 T.N.,Clark,AR census is the son of Thomas and Menever/Minerva Minyard.I saw some family files who listed him as James Monroe, but he is listed only as James on the 1870 census.Per the 1900 Fannin Co., TX census he is married to a Mary and his mother is living with them.
I did not see a marriage record for James and Caldonia.It looks like the marriage records online for AR begin 1779.
Hope this has not only confused you more.It is not that often you have two females with the same name born about the same time that one married a male of which there are two in the same area that is born about the same time with the same name.