Ann Thompson

https://www.findagrave.com/memorial/207517434/ann-thompson

Ann was the daughter of William Downard and Anne O'Neal, both born in Loughgall, Armagh, Ireland.

Ann, along with husband Jacob Thompson, were on the list of burials for this cemetery (probably 10 or so) which was once posted to the Graves Family web page at MyFamily.com by Louise Graves 11 Aug 2001; scanned from a Bible page (web address now defunct).

Plus, according to genealogist/writer Josiah V. Thompson in his Vol 9, pg. 522:
"The original James Brown & his wife Elizabeth Thompson were buried on the John A. Moore farm [today Brown Fam Cemetery #1 on the Christopher farm] which Moore bought from John McMullen, father of A.G. & Jno W. McMullen & it was at this same g.y. that Ann Downard Thompson was buried & at which her sons in law, James Brown & Joseph Moss were waiting when her remains in a rough homemade coffin were brought in a one horse wagon cart. Joe says, not an ox cart. From her home at her mill by New Salem, her home being the stone house, partly torn down by Geo W. Hess in 1871 when he built the brick home. This mill once belonged to Judge Robt Boyd & also to Caleb Antrim."

Although several sources confirm Ann's burial here, there's never been a marker found.