What is my moms problem?

My moms been going down hill for the past few years. She drinks atleast 4-5 beers a day, and when I confront her about it, she laughs in my face and says "Oh nothing honey" or "Hmm I just felt like it" as if her getting wasted everyday is not a big deal. She is not a nice drunk, she is rather rude, and makes ual comments about my dad and men on tv, also men she has had with. I don't know why she does this. I know she is a dependent person, hasn't been employed in years and depends on my dad (her soon to be ex husband who she rages on about kicking out, and she doesn't understand that we have NO MONEY). If I tell her about the no money situation she says its all my fault, because of all the things they have to buy me. She has slept with guys that she barely knows. Obviously they are just using her for since she 'hosts'. She thinks that they 'really, really love her!' when they are 27 year olds and 35 year olds looking for a thrill. She tells me about when her and this guy 'charlie' will come over to have so I won't be home. I think she is hooking up with guys at bars. She is 54 years old, you would think she would grow up, but she never does. Another thing is is that she is on anti-depresents and other drugs (not illegal ones but medications). She calls me fat, and weird because I go to a more private school, in which I really like. She'll deny it later as she doesn't remember it the next day then gets mad if you confront her. She sees a therapist, but thats not doing any good, the therapist is a complete and total quack who agrees with any lunatic idea my mother has. What can I do? She doesn't even see that she is hurting me by her rudeness and her actions.