controlling roommate

ms
My roommate acts as if the apartment we share is HER apartment!
She literally knocked on my door and basically told me my guy friend needed to leave. Mind you we were actually asleep. I don't care if she doesn't allow her bf to stay. I pay my 800$ just like she does. We aren't loud, he doesn't go into anything or eat anything that isn't mine. He doesn't come everyday and he gets off late. Should she be able to tell him when to leave? I don't tell her when her bf needs to leave!