You could meet the police down by the door, just pretend, if need be, that you are going shopping or waiting for a friend who is late to pick you up? Talk to the police by door or someplace you designate nearby--do you have a cell phone to call from outside? I understand your frustration. I used to have a neighbor like that, but it was limited what we could do, also. The girl was teenage, and she came to us for temporary safety a couple of times, but the mother came for her before I had any chance to ask what was happening.