Neighbor Problems please help.?

I live in Indiana and there is a neighbor who goes around looking for drugs all day and night and being really loud at all hours. I live in a double and the guy next to me is an 80 year old man she is taking advantage from, taking his money and pills. She comes to the front door and pounds on it and if he dont answer she begs to open the door. I had given her warning to stay away but she still comes back. We got into it early this morning cause her lound mouth woke me up and found out she was in the back yard going through things. So I called the police and they came out they told her to go into her house. Shortly after the police left she got in her truck and hit some cars down the street. Cops came out again and still didnt take her to jail even though her license had been suspended. What can I do about this pill popper when the police wont do nothing. The neighborhood is fed up with her.