I know you love her but you need to love yourself more at this time. Her behaviors will continue to affect you as long as you remain invested in the situation.
Your GF has to want to get sober for herself. No one can make this happen but her. She may have to get worse before she gets better.
I am sorry that your relationship and life are suffering from alcoholism. You do have choices and it would be a positive if you made choices that revolve around what you need and what is healthy for you.
The friends and family section of this website deals with these scenarios and they may have words of wisdom to offer.