Julie, Did you check the Absolum Oxford family tht has a Sarah Oxford-- those were all Illinois born people I think in Hardin Co. and more likely to be your Sarah Oxford.
The Daniel Oxford family was all from Kentucky and dau Rebecca m. Valentine Smith and on Hopkins Co. Census 1860--Saratha m. a Clendening (my Craig Ishmael m. a Clendening) John Marshall Oxford (son of Daniel) m. Melissa Clendening and I believe their daughter Sarah married Chas Ishmael, whose son Craig married a Clendening.
Do you have some reason to think Sarah, dau of Daniel left the rest of the family and went to Illinois?There were other families of Oxfords in Hardin, and more likely your relative.On the Calhoun Co. census your Sarah reports being born in Illinois.My Sara consistently reports being born in Kentucky.
This family was from Allen Co., Ky and in Lamar Co, Tx 1850 1850 Lamar Co. Texas Daniel Oxford 45N.C. Mary 37 Ky Rebecca16 Ky John M. 10 Ky Sarah 7 Ky