You need to document the incident including by having your daughter write a statement that carefully recounts exactly what happened during the incident, where it occurred and at what time. Also the statement should identify any possible witnesses to the incident. You should then arrange a meeting with the school principal as soon as possible. If you are not satisfied with the response you get from the school administrators, you should make a similar request, including documentation concerning the incident to the school district superintendent. You should also take steps to have your daughter transferred to another classroom as soon as possible. Because this can involve a teacher personnel issues, you will need to be very clear about your concerns but make certain you communicate with school district authorities.
You should consult with a personal injury attorney as soon as possible.
This advice is not a substitute for a thorough evaluation of all of the facts of your case by an attorney with a background in education law.