Dd 15 has fallen out with 2 former friends, they are making a point of sitting near her at break time & talking very loudly about dd. They're also checking her facebook & both ticking the "like this" thumb. Last night it went to a new level with one of them being abusive/ name calling on Facebook. Dd doesn't want me to phone the parents or go into school. Neither will she block & delete them from her facebook account. She says it'll mean she's weak. She's deleted last nights posts. I don't know what to do, the one who was posting on facebook has been in trouble for cyber bullying in the past. I feel powerless and hate seeing my dd suffering.