Unfortunately it is only the drinker who can make that decision. The nature of the disease is until they accept they have a problem, they wont stop.
If they think they are being cornered into not drinking, they wont give up. That was the way for me.
I wish it was not so.
For me, I had to get mugged and beaten up before I realised that I was letting drink destroy me, and even then it was a long journey to sobriety, you can support and encourage, perhaps plant the idea in her head to go to AA.
I wish you well, I wish I had a better answer, I hope someone can give you a better one, from their experience