Roommate will not LEAVE?

I had a falling out with a roommate who basically threatened me. She wont leave although she is NOT on the lease. I gave her the 30 day notice and she agreed which basically means shes living here rent free during that time. and she has a pitbull she is going to bring into my apt and they arent allowed here and that will get me evicted and i cant have that. What can i do to get her out and have my apartment back to myself? I also made a mistake she is an unauthorized tenant not being on the lease and that is a lease violation. Mistake i okow but what can i do and wha are my rights regarding this?