Mary M McQueen, Horry Cnty, SC

Does anyone know what became of Mary M McQueen born about 1860 daughter of Samuel B. McQueen and Margaret F. Graham.I believe this Mary M may actually be the wife of Washington Fowler.They named two twin sons McQueen and McQuin.Some people have claimed Washington's wife is a Fowler, daughter of Harmon Fowler but I have seen no proof.Any help would be appreciated. Thanks.