Ineed questions about the effects of concussions asap

The coach pulled my child from the game after she collided with a teammate. She got up and stumbled and looked dazed, but said she felt fine except for a mild headache. Is it really necessary to take her out of the game?
My child did not lose consciousness. Does this mean my child did not have a concussion?
Do I need to wake my child up every hour when s/he is sleeping?

Hey : )a transition from the first energy level to the fourth energy level

Im here for points, sorry i dont have the answer ; /