I think you have to worry about your own sobriety first. This is NOT a good scene for you to be dealing with.
I know that you care for her, but she HAS betrayed your trust, and is dealing with her own stuff that you can't really help with anyway.
Keep going to Al-Anon, and keep talking to your friends in AA. Do you have a sponsor? If not, this would be an excellent time to get one.