Mother has become a recent alcoholic.

hi, i was wondering if anybody would have some insight because i am at a loss it seems. my mother who has been a constant all my life has been, for about 2 years now, drinking and has done a good job at hiding it. lately it has gotten worse. ie: falling down stairs, ping/blacking out... i now have a 4 month old daughter and my mother made my pregnancy miserable. calling us to start fights, getting me riled up any way she could. i almost felt at one time i was going to lose the baby she hurt me so badly. my mother and i have always had an otherwise wonderful relationship. well, as of late, i have cut off contact with her for my sanity. i don't want my young daughter around a drunk. my father works long hours and just doesn't, i don't feel, know what to do. if he did, he'd get her into some kind of rehabilitation program. it's not like they don't have the money to do it. he works alot and i think has been turning a blind eye. this is killing me and i am not sure what my next move is. i know my mother will not get help because "she just can't leave her house" for the cold hospital setting. i know that is a cop out... i heard from my sister that she wants to invite us to dinner a few weeks from now. i can't help but think that it will just be another "brain washing" session, making us think she's "ok" and that "things are alright because she is a functioning alcoholic." i am so hurt by all of this. i love her and hate that i am utilizing tough love... any insight would be appreciated. please, serious answers only.