Who was the mother of Thomas Jefferson Whitfill?

Need help regarding the ancestry of Thomas Jefferson WHITFILL b. Mar 1832 Grayson County, KY. d. 18 Jan 1912 Hardinsburg, Breckinridge, KY. [m. 9 Oct 1856 Effingham, IL Spouse: Elisabeth Ann NOKES b. 3 Sep 1839 Decatur, IN d. 1908 Hardinsburg, Breckinridge, KY.]

His father was Robert WHITFILL (b. abt. 1800 Washington, KY) His mother is listed in his death certificate (reported by Angus Whitfill) as Betsy SHAW. Other sources have stated his mother was Elizabeth CLARK.