Should I confront my alcoholic mother?

I am 19 years old and back home from college for the summer. I dont know when this started exactly, but this summer my mom has been drinking a lot. She goes through bottles of vodka and whiskey so quickly. Shes passed out on the floor twice. And she like falls down so i hear when. I go and ask if shes ok and she just looks at me with a glazed look n says yea. I haven't said anything to her. Everyone just pretends that it doesn't happen. This drinking is also sometimes accompanied by binge eating. Should I confront her? if so....how? I feel like its a lost cause. She does not want to be healthy. Shes also overweight.....What do i do?