To anyone claiming that she was to blame, or that the cop had no other choice, or whatever. Here's what happened in my high school during the numerous times I saw kids on their phones, ignoring class.
1. Teacher tells student to put the phone away.
2. If the student ignores the request, the teacher threatens to write the student up.
3. If the student continues to refuse, the teacher writes the student up, then continues class. The next day, the student is suspended.
Look at that! An alternative! Sure, it involves letting an "inferior" disobey and order, which I know is tough on ones ego, but it also involves no violence and no class disturbances. It's a tough choice, though, right?