If there is proof of who Mary Kuykendall married, I'd love to see it, too. A researcher or two in my Carroll line believe that she married Joseph Carroll around 1760.
These Carrolls were living in far western VA and never were in SC. The Kukendalls were supposedly in Rockingham CO. VA, all of which which makes it problematic for a marriage in SC.
Good luck, and please reply if you find any proof.