I've put an unmerged match on her. Fight me.
I have no proof that she is the same woman as Mary Ann Stillwell 1812-1900, but there are an awful lot of coincidences. 1) a birthdate of 1808 is unlikely as her parents didn't marry until Aug of 1811. A birthdate of 1812 is more likely. There are only two Joseph Stillwells in Kentucky at the time - and the other one would be the grandfather. Mary Ann Stillwell Married in Campbell County - close to Mason County where Joseph lived. JE Parker (her son) states that she was the oldest of 8 children - as is the case here. Stillwell-901 has no info on what happened to her. There is a more complete bio in the bio statement from JE Parker.