Make a formal complaint with your law enforcement and press charges against this kid.
And also go to welfare and file child abuse charges against her too.
If you keep *****footing around with school, nothing will get done.
And also see if your state has anti bullying hotline to call and complain about.
When these things keep happening, I don't understand why parents don't step it up to involve charges.
The schools don't care, period.
And all the anti bullying laws will not stop this, bullying is part of human nature basically.
What used to keep it in check was parents disciplining their kids, and kids knowing there would be consequences for bad behaviors.
But go to the law, and press charges.