I'm so sorry you are dealing with the heartache of watching your child make these horrible choices.
Is your mother aware of your daughters addiction? I hope that your daughters reasons for wanting to go live with her aren't to pawn all of her jewlery and take every cent she has by begging for money when she runs out of things to sell. I only say this because I have seen this happen many times and it is heartbreaking.
All you can do is work on getting yourself emotionally and physically healthy. Your daughter is a grown woman, and needs to feel the consequences of her actions. Have you thought about setting some boundaries to help protect yourself from the chaos of addiction? At least if she moves out you won't have to witness everything she does day in and day out.
Try to put yourself first. I know it is hard, but it is all you can do. The only person that can help your daughter is herself.