Dont be scared maybe people didn't see it!! I would think that if she has chipped one of them then the bump may have done some root damage, I would be going to a dentist not the Dr hun, they will be able to have a look, xray to see if the adult teeth are ok and give you some advice. DD hit her tooth a few months ago at creche and pushed it up into her gum. It has slightly changed colour as have the teeth next to it because of the force of her hitting them I guess. We went for a few app's already and then again near Christmas time for a check then yearly after that until the adult tooth comes out.
Good luck hun xoxox