Poor girl
I'm sorry to hear about that, Rogue, but glad to hear there doesn't seem to be any serious/permanent damage.
I had kids push/trip/beat me on the playground all the time. It's really easy for teachers to ignore/not see it. Broke my wrist twice on the same playground (once in the winter being pushed on ice, once in the summer being tripped in a game of bump (pickup basketball shots)) and no teacher saw/did I thing until I ran up to one with a messed up hand : /