It sounds like she's a full blown alcoholic and as you've found out, trying to get in the way between them and their booze, is a sure fire way to set them off.
Alcoholism also is something that gets nothing but worse over time, so right now is the best you're going to see her at. Also pancreatitis for sure is something that can happen from alcohol abuse and can get serious quick.
Unfortunately there is nothing you can do to get her to quit unless she chooses to do so on her own. Attending alanon would be a good place to start and you also may want to take a serious look at your relationship, especially for the well being of your child.