Is it normal that i hate my gfand her whole family?

I have never been so frustrated in my life. I got into a relationship 2 years ago and just like everyone you don't know the person until you are living with them. My girlfriend is really messy, when we eat she always, ALWAYS leaves leftovers on the plate and instead of getting rid of the food she leaves the plate anywhere she is eating at the moment and the plate stays there for days until it starts smelling like shit, she does that with all the plates and in 4 days or a week there is a stack of smelly roting plates in our room. Ive told her that if she doesnt feel like washing the dishes to let me know and I gladly will do it, but instead she says she got it when she doesnt and always forgets about it, same thing with baby diapers, bags of trash I mean she never takes anything out if I dont tell her. I work all day and she is home all day, I dont understand why she likes living like shit, is not like she s disabled or anything, she is a young 24yo girl. Her mom is a pill addict wine drinker alcoholic, one day she visited in 2010 dropped a pill and our daughter of 8 months at the time swallowed it and had to go to the hospital. This happened again on Sep 2011, where she dropped a pill and our daughter swallowed it and went to the hospital again, I was so fucking upset because my GF did not care she said it was an accident, AGAIN? the thing AGAIN? if my mom would've committed the same careless mistake twice I would've been pissed off at her and not let my mom see my kids. But not her, she loves being with her pill addict wine drinker mom of 55yo living like a damn redneck in a redneck town named Placerville, Ca. Her mom receives social disability check thing as well as her dad, uncle, aunt and grandma. The whole family is FUCKED. lowlife rednecks hooked on drugs and pills. I am sick of everyone including my GF not being a clean person and always wanting to visit her mom. The dad and the mom do not act like grandparents, they never call or come to see the kids. I feel like my GF is going the same path her mom is going, every time she gets sick of anything she wants to go to the hospital and get pills. One time in March of 2011 she visited the hosptal 4 times in that month because of her always getting some bullshit sickness. I mean is not her problem and everyone gets sick but sometimes I really think she just does it for the pills. I dont know what to do, she is a mess and her family is crazy.