My daughter (age 11) has, and is a member of, an anti-bully club at her school. They meet during lunch, recesses, or after school and they discuss bullying, set up skits, make and hang posters and do demonstrations along with their teacher advisor to show how to cope with and handle bullying. They also keep an eye out, like a sort of community watch, and report any problems they see in the school. Perhaps a similar club could be suggested to the school you are helping.