Try to see if her enthusiasm for Bama is in all sports or just football. Many Bammers only care about football. If this is the case with her, try convincing her to watch Big Orange Basketball. She might not be as resistant to cheering for the Vols in sports other than football. IF, and that is a big if, you are successful in converting her to cheer for Tennessee in other sports, there is a chance with time she will cheer for the Vols in football as well.