I would suggest leaving a note for her to read telling the truth of what happened. Ask her what is wrong of you asking her to turn down the music; that was not accepted. Tell her you were not the one who had called the cops with which you did say that you wanted to. Ask her how am I a problem here?

Because otherwise if she does threaten to physically hurt you then you can show the cops in a note she may write back or on your phone or throw facebook. That note can help you.

Then if nothing is solve that way then find another apartment through a nice realtor.