I believe I have finally found proof that Mary's last name was Keeling and she is the daughter of Richard and Mary Fowler Keeling of Shelby Co, IN. They were orginally from Washington Co KY, which is adjacent to Mercer Co, KY. Some of the Trowers moved to Shelby Co, IN also, and as the story goes William traveled to Shelby Co to visit family. He met Mary and they eloped. Richard is a descendant of Capt William Keeling.