When I was in my young teens, I kept saying how much I wanted to move in with my Mom all the time. Sure, my Mom probably would've given me more freedom, but the one who really cared about me was my Dad. My Mother wanted everything to do with me but refused to take any of the necessary steps to do so.
I just recently realized that. Kids will be kids. They make mistakes and learn from them. You just have to give her a little bit of time. I'm awful sorry to hear about all the pain your going through because of it. She probably doesn't know how much she's hurting you. Just do the best you can to support her and she'll remember who really cares. I really hope things start to get better for you.