Hi tradiola,
Hope you can check out the "Stickies" on the top of the forum. Lots of useful info there.
Its sad to hear about her struggles but ultimately they are her struggles. No one but herself can get her healthy. Let her solve her issues and put the focus back to your life. I know that's easier said than done. I had an ex that is alcoholic and its difficult to watch someone self destruct. I have been able to find peace about handing him to God/Higher power and talking with people that get me and value me (good friends, family, SR, therapist).
Book recommendation : "Codependent no more" by Melody Beatty. Hope you can get yourself a copy. Keep reading/posting here, this place is a lifeline. Also remember the 3 Cīs
You cannot control her
You cannot cure her
You didn't cause this
Hugs and welcome!!