When she steps in to run the class, is it at the invitation of
the regular instructor, or does she just take it upon herself to take over? If the instructor lets her do this, I'd have a serious
talk with her(Instructor) & explain your feelings about this just the way you have here. I'm sure the instructor wouldn't want you to leave the class over this. Call her outside of class time & explain things to her, or ask to speak with her/him privately.

Please don't let this person ruin things for you & Malone. Do let us know how this goes o.k?