How can I get rid of this hate towards my mother in law?

I know this is mean but she has ruined my marriage! and im not completely happy because of her. She lives with us in our apartment, she is so messy and lazy she doesnt do nothing in the house. She treats my husband like a baby (hes 35) she pretends to be nice but is not. And she is always getting in our business. She acts like she's miss knows it all. It bothers me so much that she acts like she knows about babies. When my son was newborn he had colics and she said that she was 100% sure that he had an ear infection instead and told me to put 2 drops of milk inside his ear!!! I told her nicely that I would not do that and she got mad and wouldnt talk to me or even look at my baby's face for more than 1 week! She says mean things once in a while like. And last night my mom came over and she went and told my mom (oh your daughter doesnt like when I give her advice she gets upset and I feel bad about it) my mom doesnt care but I hate how she goes and tells on my as if I was a little girl!!! I just cant live with all this hate How can I feel better toward her? I just wish we got along better!!!