Really? Tell us how it should have been handled. Specifically.
Squirt her with skunk oil!
Or, drop a fresh turd in her lap.
Based upon watching the video, my opinion is that the officer used excessive force. He flipped her backwards, chair and all, onto the floor and then threw her. What should he have done? Well, here are some ideas: (1) two adults could easily carry her, chair and all, out of the classroom, without resorting to any violence; (2) if an officer thinks physical force will be required against an unarmed person and there is no immediate physical danger to himself or others, why not call for backup before going WWE on her? I would fire this guy in a heartbeat.