I had the same problem with a male friend. I did my best to help but figured out I cant help him, HE is the one who has to help himself and he doesnt seem interested in that. At least not yet. He hasnt hit bottom but he most be really close.
I just had to stop contact with him, which was hard to do, the first time I've ever had to do that with anyone, drunk or not. I dont think you will get anywhere with this woman, it's she that has to recognize her problem and then decide to do something about it.