Criminal Law Questions? Ask a Criminal Lawyer.
Thank you for the information and your question. However, I am unclear on what this person is doing that might be illegal. If she is breaking into the house (coming in without someone letting her in and without permission from anyone who lives in the house), then you could report that to the police and they could either issue her a trespassing ticket or maybe a breaking and entering charge. But, it sounds like at least one of your roommates is letting her in. If that is the case, I don't see a criminal act in what you described.
If you are wondering about the false statements, then that is a civil matter. If they are false statements of fact that damage your reputation, then you should speak to a personal injury attorney who handles defamation cases and see if they think there is enough there to file suit. If nothing else, they could write her a "cease and desist" letter to try to keep her away and from telling lies about you.
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