@edgarblythe,
I asked my daughter if her friend talked to her parents about this and she isn't sure.
I told my daughter I was surprised the school did nothing - I told her obviously they cannot punish her as it could be an empty threat. But with her history (and this girl has already been in trouble in the current school year so also at this school) - I would think it would warrant a discussion with her - to at the least make her aware what will happen to her if she has any school rules broken.
Funny in middle school my daughter witnessed boys being inappropriate on the school bus and I called the school - it was taken care of immediately. But maybe because they had already broken the rules.
But no child should feel unsafe going to school.
My even greater fear is this girl does something to my daughter's friend and my daughter jumps in to protect her and she gets hurt or in trouble for fighting. I cannot tell her not to jump in and protect her friend - as that would be the right thing to do.