There has been NO documentation given for this entry nor her parentage

Her maiden name possibly could of been Cunningham. This is given in an Acestral file that list multiple parents for "McKee's"

 Some  say that  she is to her to be  [http://www.geni.com/people/Agnes-Cunningham/6000000006727965010  Agnes Cunningham] ; b.2 Feb 1706/7 Drumbo, county Down,Ireland, d. 29 Jan 1780 Kerr's Creek, Rockbridge, Virginia/ 11 Jun 1774, Kerr's Creek,   Botetourt, Virginia.