According to Find-a-Grave, it is this Thursa's husband Joseph Carr Sudduth who was a child of John Field Sudduth and Rachel McMakin. Thursa isn't listed among their children. If she were, she and her husband would be brother and sister:
https://www.findagrave.com/memorial/17696732/john-fielding-sudduth
The correct information for Thursa, including her photo, is on her Find-a-Grave page:
https://www.findagrave.com/memorial/43890994/thursa-sudduth
