My friend is still suicidal, the situation is the same as before, and sometimes I just have to ask myself, when will it ever stop?

I was in 6th grade when one of my friends started being bullied. The girl who had started the bullying was just awful. She used to rip apart people's homework, and just call everyone she disliked names. Now this girl was especially interested in my friend because my friend was dating the boy she was supposedly madly in love with. The girl bullied my friend physically and emotionally through the Internet and during school, making my friend suicidal. I had tried to alert the teachers about this situation but they simply ignored me. Finally, one of the teachers became aware of the bullying and after a bit of questioning not only found out that my friend had tried to kill herself but that other girls had, too. The bully was arrested and suspended for a month. But the thing is that even though she is closely watched by the teachers, the bullying hasn't stopped. My friend is still suicidal, the situation is the same as before, and sometimes I just have to ask myself, when will it ever stop?