There is no Mary Wells in my data base that meets your description. I do have two Wells families out of PA--distantly related--who were neighbors of the Washington Co IN Spurgins, one of whom fought in the same regiment in the War of 1812. The Sarah Wells who married a Spurgin male and settled in Johnson Co IN is the daughter of a Richard Wells of Fayette Co PA and Henry Co KY, not related to the Wells family above. Coincidentally, however, Cadwalader Jones, nephew to the Washington Co IN Spurgin men is also a nephew of another Cadwalader Jones who married into my Wells line in early KY. This branch of the Jones-Spurgin family were members of the Abbot's Creek Church in Anson/Stokes Co NC - but originally from PA. There are many branches of the PA Wells families and it is possible that some of them migrated into TN. Unfortunately, there are approximately six lines that have not been researched at all, where the original settlers simply disappear in the mid 1700s. If you had a place of origin (from 1850 census) or perhaps the name of a parent on the marriage bond, that might be helpful. I do have some information on other Wells lines.