Ask her.
Ok, coming back to just add, it might help to start a dialouge about this. When is the divorce? Who's moving out? Her alcohol problems aren't really your business unless and until it might interfere w/ the kids, which I could imagine would be a concern w/ her drinking and driving. Hopefully next time she decides to do that, she gets pulled over. If she were to tell you "this is why I'm doing xyz.." would it matter? Protect your recovery.. and your children.