Dear Music
Your girlfriend is going to do what she is going to do.
Have you tried AlAnon? I can't recommend this program enough. I go to an online meeting every week and have a sponsor who lives cross country. I stay in that program even though I don't have any alcoholics in my life currently. I do it for me.
As we always read at the beginning of our meetings:
"We come together to learn a better way of life, to find happiness whether the alcoholic is still drinking or not."