***UPDATE #3****

It's been a week since our meeting with the principal. one of the "suspects" was taken out of my daughter's lunch hour and was seen sitting in the hallways with a teacher during lunch. This was the case for about 4 days, and now this "suspect" is back in the lunch room. this is the person I've suspected of being the one behind the harassment but never had any proof to show it. the principal has not been back in contact with me to tell me if they ever figured out who was behind the harassment. Should I be bold and call and ask her? I have my suspicions, but hearing a confirmation would be nice. or should I let this lie as the harassment has stopped?