I know how it feels to be thrown over for someone new. It really hurts. My Mom has done it to me all my life-everything&everyone has been/was always more important than me-her only child&only daughter. I don't know what to tell you except give it time, don't issue ultimatums(her or me)&try to continue to be as sensitive&supportive as you have been. This is a big change in her life, hence in your life. Hang in there-she may find that her Mom is not as nice as she initially seems&that if she thinks about it, life without you may be more than she could take. She's just excited&that will wear off-I guarantee it.