Can I sue my daughters school for failure to provide proper care when she was tripped and got hurt?

My daughter was at school when another child tripped her and she feel down hard, there were three teachers there with the children waiting for the bus when it happened. My daughter was limping and crying and they just sent her home on the bus. I was never contacted about the incident nor was she given ice or anything for it, just sent home. That night she was in horrible pain so we got up the net morning and took her to the ER and they took xrays and claimed to find nothing. She was then a day later taken to an orthopedic doctor who looked at the hospitals xrays and immediately found a fracture on the side of her foot and she had to wear a cast for over 5 weeks to correct it. This happened march of this year. I dont know what to do