A little under a year ago I broke up with my (ex) girlfriend because she cheated on me. I told her to get out of my life and I would stay out of hers and that was the end of it. Well for some reason this semester she keeps coming to my house uninvited and will not leave or stay away no matter how much I request it. Her response is always a long the lines of "you can't tell me what to do"
About the house:
it's owned by the college we both attend
there are 12 residents in the house, all of which say she has no reason to be here
she has been over 3 times in the past 7 days
she slept on the living room couch one night
I have tried telling her that she is on the black list we made and cannot enter the house.
How do I ensure that I can live peacefully in the privacy of my residence without her coming in whenever she pleases? We keep the doors locked but she either a) comes over with her friends who we are fine with or b) sneaks in when we have a lot of people over.
Is there something I can do legally to get the point across to her that she can not be here?
This is in the US