Narja on Family Tree Circles

Hello Everyone,
My particular interest is in "Ann Overton". She married James Hill and together had 13 children. One of the children "Lucy Overton Hill" married William Garvin (1813) (who I am connected to) and together had 14 children. This Ann Overton has absolutely no records to go by for hopes of a connection with any Overton family (other than the most likely websites connected with James Hill). I can not seem to connect her with any family or siblings. She most likely was born after 1758 (since this is the date of birth for James Hill). A marriage date of 1775 was given (by another website), which leads to the age of 17 and could be probable. Although I can't seem to find some kind of record with her association. James Hill and Ann Hill (Overton)'s family seems to be in Amherst, Virginia and surrounding areas. Some descendents I have came across and have connected with are from W. Virginia (Monroe, Huntington) with surnames of Burdette and Cottle. This indeed gives light on James Hill but even those surnames leads to no avail on "Ann Overton".. Her surname seems to come up with question, as if some researchers can not connect her. If there is any info to this mystery of "Ann Overton" will be greatly appreciated.