I was told before I decided to show up at her door, that I could "deal with it" and was not getting my mouse. I wasn't going to just let her keep what belongs to me without trying to get it back. I did not force entry anywhere. The homeowners (not casey's family) were told why were there and allowed us in. We did not go anywhere we were not invited. We sat in the living room while one of the homeowners went to the basement to talk to Casey (where she went after she yelled at me to leave). We told them we would call the cops when Casey did not give us the mouse, after she said no the homeowners told us we could go to the basement to talk to her (we didn't WANT to call the cops). After she told us no and ran with the mouse up to her room, we went outside and called the cops (though the homeowners told us we could stay in the house) and did not try to reenter.
I believe Casey is in her early 20's...but I am not sure.