My wife is lazy, what can I do?

My wife and I have been married for almost 4 years. About 9 months ago she quit her job when her daughter started school because between travel, work, and childcare expenses we were losing money with her working. She started out doing well with the stay at home mom idea, kept the house decently clean and keeping the kid focused and well behaved. The last 5 months though she has become lazy. I am working almost 70 hours a week in a new job and just keeping us barely afloat and she won't even do the dishes, laundry, or keep a decent eye on the child. She didn't do dishes for 4 weeks and finally i did them because I couldn't take it anymore. The child runs rampant and has become a discipline problem both at home and school. Anytime I try to make her behave I am verbally assaulted. The child's father has never been in her life and she has always called me dad. I have raised her since she was a year old and try my best to be a good father to her. My wife recently has gotten out of hand with her behaviors as well. She has a history of abusing prescription pain killers and recently fell back off the wagon. I have had it up to here with her behavior, but I know if I leave then the child will be screwed. Her mother doesn't cook anymore she just orders take out or tv dinners. She doesn't seem to care if the child is in school most of the time ( the child is 5 ) or the fact that the child isn't developing her reading skills. I have on more than one occasion threaten to call the school and tell them she is missing because her mother is lazy which prompted her to take the kid. Bottom line if I leave the kid gets screwed and according to a lawyer I spoke with I have no legal rights to take her. Her bio father is a complete deadbeat and my in-laws are of very little to no support. They don't have alot of contact with my wife except when it is convenient to them. My mother thinks I should just leave and wash my hands of the whole thing and my grandmother says to tough it out. My dad and I haven't been speaking lately due to another issue. My wife also keeps us broke because of her spending habits and doesn't seem to understand that paying rent is not a gratuity. I found out she hadn't paid in two months after she told me she had and wound up spending our tax return paying rent instead of putting tires and brakes on the car. She has been so bad she is actually going to court over a bounced check on an account I closed 6 months before she wrote the check. What should I do?