my mom drank all the time when i was a child... she also did a lot of really bizarre things. It took her into her mid forties b/f she finally grasped reality and realized she had to change.
What actually did it was that my youngest sis, all of five, called the cops on her... she ended up in jail for child abuse (over night), my older brother read her the riot act and refused to bail her out, child welfare was going to intervene unless she did x, y and z. Well, while it took that to get her to STOP, she has stopped and remained stopped.
Unfortunately, as many have said, until she is wanting the change, you can't do anything to help her. On the other hand, you can do something to help yourself... put distance between her and yourself, don't live with her, hold her accountable for her actions, don't allow her to talk/be around if drinking, etc.
Peace, Levi