I Hate My Mother In Law and Sisters In Laws

So im really feeling crap now. Its been building up for a while. My husband and i have been married for 2 years. My mother in law was in india and after i got pregnant she came here to live with us and to help out with the baby. My son is now 8 months and my mother in law has really ruined our marriage. She constantly says my parents should be giving me a house and lots of money and etc. before i had my baby she was preasuring me into getting a job after i have my baby. My son was 4 weeks when i returned to work to get awat from her. She constantly steals stuff and always steals money from my wallet and acts all innocent when i mention to hubby that money went missing. I know she has the money because it fell out of her bra and she thought i didnt see it. Now i purposely put small amounts of money in the house to see if it goes missing. Anyway she cut up my work shirt and uses it as a mop and then puts it back in my drawer. If i say anything to my husband he doesnt want to hear it because its his mum and in indian culture, regardless if your mother is right or wrong shes always number one. So today i felt so ashamed when the neighbours bought groceries for us and we didnt even know about it and she told me to pay them $50. My hubby did not say a word to her. He thinks its ok but i feel ashamed because we work so hard and we both work full time so we can obviously afford groceries on our own. But the fact someone else buys groceries for us, its embarassing. Theres a lot of things shes done like stealing, lying and constantly taunting. But today im at a breaking point