I've got lifetime of experience with alcoholics. I won't expose any details here for obvious reasons but let's say that on top of obvious family problems I have tendency to attract people with such issues.
Without any doubt: DUMB HER. Leave her. There is no "help".
Alcoholics are master manipulators. I don't even consider them as humans. They're living zombies, horrible, void creatures and whatever illusion of humanity they create is fake. She may not be in the "zombie" stage, that's usually at the point they realise (but never fully) they have a problem. She is still very dangerous to you and your sorroundings.
The very fact that you care is enough of a proof that you're not emotionless bastard. She can use you, play on your emotions and fuck your mind for good.
Don't get fooled, she WILL go down, REGARDLESS of whatever you or anyone else might do.
Stay the fuck out of it.