help!!!

I need to know how to get along with my fiancé’s mother, most of the time we are like best friends but sometimes we get to intense conversations & im not one to back down, not gonna let anyone run over me. The problem is, my fiancé and I live with her as of right now so I have to see her everyday. Trying to save for our own apartment ASAP but I really need help because I don’t want to get kicked out for speaking my mind y’all.