Should i tell?

You need to tell some one. That is so not good. That girl needs help and for her to force some one else to do it is wrong as well. You have got to tell someone a teacher at school a parent whoever but someone and if you tell a teacher or a parent you can make your self anonamous and tell them you would rather not give your name out or tell a teacher you don't want the girl to know it was you who told them.