The bully is not scared because nothing is going to happen to her.
1. Her parents most likely do not care or they are bully type people also.
2. She was off the bus and no longer the problem of the school,
3. She is a juv and the police if they do anything at all, ( and I bet they do nothing) will have her to to juv court, where it is all society issues and they put her in some probation for a few months.