Gosh, such hard stuff.
The thing is Sober.....you do love her and she isn't too much trouble, and because of your experience with your mum you get to be compassionate and helpful here because you really get it.....and please remember that girls go through such deep emotional shifts. and a lot of her stuff is part of where she is in life. It's a tough time. And no matter what happened before, you get to be there for her now. That is precious.