Sorry you are all going through this--and I mean all of you, including your wife.
Regardless what happens with your marriage, she will continue to be your daughter's mom and you will, therefore, have to continue contact of some sort for at least the next thirteen years or so. You can't control her alcoholism (as you have learned), but your daughter will need sanity and stability in her life.
I strongly recommend Al-Anon to help you with learning to live with (not physically live with, but co-exist with) the alcoholic who will remain in your life for the foreseeable future.
Sounds like she is not ready to quit drinking YET, but there is always hope.
Glad you are here with us--there is a lot of wisdom around these forums.