My boyfriends mom calling me names and more? and she's 49 and im 12!?

ok my bf's mom hates me for sumthin i did earlier. and now she's been calling me a c*nt b*tch and s*ut and a lil' . o and she alos makes comments about how i have "no " and she's 49 and im 12!! and she's also an alchoholic. she sys these things to my bf all the time. and she slaps him and grounds him wenever he sticks up 4 me. im sick and tired of her. i just cant believe that a 49 year old "grown-up" woman would sink so low as to tlak about 12 year old girls like that. oh and did i 4get 2 mention she talkes about my friends like that 2. she calls them the same exact names she calles me and they hate her just as much as i do. my moms even tlaked 2 her on the phone and told her i was upset about he calling me a and she said i wasnt calling her a i said she was acting whorish. it just makes me sooo mad wenever my bf tells me that she's been saying stuff like that. i even told him that she's a psycho ******. he says i no. will u plz help me!?!?