<human>: Condense the text into a few key points

I went to a friend's party in a different unit in my building a couple of days ago. There was one individual there who I have known for some time, but wouldn't go so far as to call friend. She was telling me that her bf broke up with her and so she is currently not staying in the place she shares with him.

In my druken state, I must have agreed to let her stay with me because when I woke up in my own place the next day, she was on my couch. She asked if she could stay with me for a couple of days. I was uncomfortable with this since I have only ever seen her in my other friend's parties, but, to avoid confrontation, I said alright whatever. This was on Sunday.

Fast forward to today, she is still here. Today, I very explicitely asked her that I am not really comfortable with someone shacking up with me like this and that I need her to go. She got visibly angry at this, claiming that she is a model guest and that she barely does anything but sleep on the couch [which is kind of true except for the fact that my food is finishing twice as fast]. But, it is my place after all and I told her that I don't care and she needs to leave right this instant. 

Now, she is claiming that she has 'established residency' and that if I want her to leave at this point, I need to go about it like a landlord would. This was this morning. I haven't left home today since at this point, I don't know if I will come home to find all my shit stolen.

Should I get the cops involved? If I use force to remove her, would that make me liable?
<bot>: friend's friend stayed with me for a couple of days. now claiming she is a resident and I can only remove her using legal channels. What to do?