If Some boys keep bullying my friend and she has already told her parents and they say something to the teachers but the boys still don't stop what do you do?

Go to school and call a conference with the parents of the kids that bully the other kid, tell them you are willing to go to cops if this continues. Get all the kids to attend that conference and teacher too if possible.

Bullying is a serious problem and nowadays schools are more likely to work with you on that subject than before. We all heard horror stories of kids that did not get any help with bullying and no other kid should go through this.

Write a letter to school, have some proof that you informed them of the issue.

Thanks,

How are they bullying her? Are they being physical? Hurting her? Or calling her names, and poking fun at her?

If the school refuses to do something, then a parent needs to speak to the district school board. Then if nothing is still done about it, police involvement may be needed.

How old are the kids involved?