Two things:

1. Threaten to leave her after a fallout with alcohol. When she is the lowest with a bad hangover this will help her realize it can get even worse!
2. Leave her if she does not stop.

My wife did the same to me. Only thing that really worked.

She needs to decide it is time to stop drinking. Otherwise it will never happen.

Maybe move in with a relative to show you are serious and only come back after her first session with a therapist.