Tishie I really don't know you, but I'm glad you were aware and didn't dismiss what you heard. Usually when an adult who is connected to an establishment to which such accusation is connected, finds herself in this position, the only real choice it to notify the proper authorities. You always report it just as you know it to be: a rumour, overheard accusation etc. They know how to investigate. Just because you report, they investigate doesn't make it true, as you know. But it's up to the investigator to find out, not the reporter.
I'm glad it was taken care of by the parents.