For what it's worth, which may be nothing at all, an unsourced tree on Ancestry suggests that Susan Gauley is the daughter of Robert Franklin Gawley (b. 15 June 1796 in Virginia) and that Gabriella Gauley is the daughter of Robert's brother John Gawley (b. 6 March 1801 in Virginia). Robert and John are supposedly both sons of Thomas Gawley (b. 1765 in Ireland or Britain) and Jane Gibson (b. 1769 in Virginia).
As I mentioned there is not a single source attached to support any of that information, and I'm certainly not vouching for any of it, but maybe there's at least a useful clue in there somewhere.