What should I do? I'm scared!!?

This girl, lets call her Becky, went to my friend's house yesterday. But my friend wasn't home. So her little sister answered the door. Becky said " Is your sister home?!!!!" "Where is she!???"And that she sounded really mad!! So, I talked to Becky's bff and she said that Becky is trying to figure out who called her a bich. She thinks it was me, my friend, or this other girl. NO ONE called her a bich!! Becky has always had anger issues and attitude problems. Anwaywas, I'm pretty sure Becky is gunna come knocking on MY door sometime today and yell at ME and accuse ME of calling her a bich. She already beat me up once! I don't want it to happen again! What should I do if she comes to my house? She knows where I live by the way cause we USED to be friends. anways, what shouild i do if she come and gets all up in my face and starts yelling and sreamming and cursing and maybe even threatening me?? i cannot fighht her okk!! and im not the type of person that talks back! Im worried!!