help I'm trying to save to buy a house so i have a roommate but shes driving me nuts what should i do?

the problem is i'm neat shes messy so she knows i will clean up after her.Plus she has a 7 yr old child part time and when he comes over they "take over" the whole place(food/toys all over)he runs screaming thru the house when i'm on the phone or watching tv.the worst part is she spolies him rotten and will not make him mind.We split everything 50/50 so this saves me alot of money. Would you just suck it up as i plan on buying a house in 1 yr.so i really don't want to find anouther roommate i would just have to live alone and pay for everything 100%.