The manuscript file found in the library in Paris, Henry Co TN, had this Sarah placed in the family of John & Rhoda Walters, who also lived in Grainger Co along with Obadiah's family. She's a bit too old to belong to John & Rhoda and I'm sure she was Obadiah's daughter.
Grainger Co marriages:
This couple is about the right age.
Not there in 1840 and no Brays at all found in Grainger Co.
In 1840, Whitley Co KY, I found a Stogner Bray.
In 1850, Stogner Bray was still in Whitley Co KY but his wife then was Polly, age 60, b. in TN. He was age 65, b. TN.