Sherry, Have you try to obtain the death certificate for Mary Caroline Fulmer Callaway? The 1900 Alabama census-Chilton Co.,ED#27, Sheet#14, shows: William J. Calloway,wife, Mary C. (b. Nov 1853 Ala), and family but Josephine seems to already be out of the household.So, the 1880 census is the only one to connect her to William and Mary Caroline Calloway.
I believe that your Mary Caroline Fulmer married William Jefferson Calloway in Coosa Co, Alabama on 20/24 December 1874.If you do not have the marriage certificate, you might want to obtain it from the Coosa County Courthouse to confirm the true date.It is possible that they obtain the marriage license on the 20th and married on the 24th.Any witnesses may also show to be of help to you in defining her parents.
It is probable that she is the daughter of Mark J. Fulmer and Martha Snider.Mark is the son of Michael Fulmer and Sallie Fulmer (cousins)See the 1850 and 1860 Coosa County, Alabama census.Mark served and died in civil war as a confederate soldier.Martha Snider, dau of George and Delila Snider.Martha remarried to George W. Strange.She is living with her son, John W. Fulmer on the 1900 Coosa County, Alabama Census shown as 60 yrs old (b. 1840). Mary is living with cousin, George Calvin Fulmer on the 1870 Coosa County, Alabama Census, showing 12 yrs old (slightly off).
I hope this helps to clarify some of the mystery.If you need any of the page numbers, please let me know.Good luck!