My girlfriend 34F wont stop drinking while breast feeding. Its breaking my 37M heart. Please help?

Let me tell the whole story quickly. Early this year we found out her mom has ALS. It is a horrible disease and she is going down hill fast. Shortly after that we found out we were pregnant. We both immediatly quit smoking weed and she quit drinking. I only have a couple casual beers here and there or a 1 oz pour of whisky from time to time. Now that our child has been born she has taken to drinking daily, and to the point of being a mean drunk. She starts fights, is rude and condicending and if i bring up my worries about the health of our baby she is breast feeding she makes it all my fault that she is dealing with her grief over her mother and her postpartum depression problems. She is seeing a counciler but who knows what she is actually telling her. I work 10 hours a day and clean our house. She has never vacummed in the 3 years we have dated. She leaves huge messes all around our house and when I clean by the next day she has made a huge mess again. I am getting tired of her laziness and her drinking and constant complaining about her problems. I cant even get a word in about my life. If i talk about how it is making me feel she just uses it as ammunition to say mean things when she is drunk. I have found my self starting to become withdrawn and would rather hang in my fly tying room or play video games then try and interact with her. Because it always seems to be she is looking for a fight. My heart is breaking at her choices and behaviors and for our child who is honestly getting the worst end of this deal. Any advice would be appreciated as I am struggling. How can I help or what can I do that wont cause her to fly into a rage?