I had a very similar experience once with a cop.

I was sitting in a public space with two people on either side. The cop told us all to move, and all three of us got up to move. But apparently the cop didn't like my "attitude", because he proceeded to cite me on the spot for "Blocking Free Movement". I attempted to apologize. I have always been brought up to defuse situations. He literally would not let me speak. His quote was: "If you say a single word, I'm taking you in and arresting you." Mind you, I had not said a single word during the whole encounter. The entire premise of his action was that he didn't like the look on my face as I got up to move, completely in compliance with the order he had given. I had done what he said, but he didn't like the look of me, so he cited me. When I attempted to apologize and defuse, he told me I would be arrested if I spoke. What's more, the ticket he cited me with required a court appearance to clear. I couldn't just pay it by mail. So I ended up wasting half a day going to court - where they were completely uninterested in what actually happened (I was sitting where the cop found me, so I was guilty) - to pay $100 for nothing. Really a memorable experience.

I feel for this girl. It's a bizarre form of injustice, and I sense it is becoming far more common rather than less so. The society we live in is dissolving around us.