It was years ago that I first posted the information about Samuel's very probable relationship with Molly Fox on an Oxford family site. I was immediately contacted offline by the head of the family association, asking that I not post information like that because it might discourage people from doing research. I explained I was posting it because, if these children had taken Samuel's surname, and if it wasn't known he might have had illegtimate sons, their descendents might not be able to make the connection. For the same reason, I'd posted that one of Samuel's sons had fathered an illegtimate child in Giles County, Tennessee. Both postigs were removed from the site.
Samuel Oxford Sr's parents aren't known. Reports that he's a son of Thomas and Sarah Lulpek Oxford of England, are without any basis in fact. Their son, Samuel, died at an early date, and the person who first proposed they were Samuel's parents, made it quite clear it was only a possibility, requiring further research. Further research disproved it.
Nobody knows the names of the children Samuel Oxford and Molly Fox may have had together, and I'm under the impression both were boys. Samuel had a brother, John, though, living in the same area at the same time, and his children are unknown. Your ancestress could be a daughter of his.
Where was she living when she married, and what was her birth date?
If I can help you, I'll be more than happy to do so.