How do i deal....?

my future mother in law called my fiance and told himthaat she will be forced not to come to your wedding because i am a no good dirty tramp and if she does she would yell out about how we shouldnt get married and all this other stuff like calling me fat and a bad mother( i have a son from my old marriage, long story) and that i am going to leave him, i have trust issues, etc. how do i deal with this? when i conforted her she said get out my house you hoe and she told my fiance you can't turn a hoe into a house wife! annd then she said that i am gullible and if he was to slapp me around a couple times i wouldn't care! and that crossed the line baecause my ex- husband beat me and abused me and it took me a couple of years to get over it1 my husband was yelling and holding her back and then she spit at me! so i drove off. ive been crying and i just don't know what to do! my fiance has been calling to see if i was ok and he was talking to her but i just don't know what to do. how do....