In all my years in psychology, I can honestly say that this bully isn't like most. She this kind of behavior tends to come from parents who fight and get aggressive. It's a big problem for a child.
Anyway, here is what you need to do. You need to drive her to school from now on. Physical actions in children lead to more.
As for the cornering in the bathroom. You need to tell her that there is safty in numbers when it comes to bullies. By going to the bathroom with more than two girls, the bully shouldn't challenge.
If she ever gets cornered alone, never let the bully strike first, your daughter will lose the ability and power of a surprise if the bully attacks first. Your daughter should never "ask" for an attack, she should say "leave me alone please" and walk away without touching the bully. If the bully then choose to touch your daughter, then she should scream as loud as she can and try to startle the bully so that she may let go and give her the split second she needs to escape the room.
If she does, she needs to go to the nearest adult and tell him/her what happened. It sounds like the bully likes to have multiple targets, so she also needs to bring the adult to the scene of the attack to save any other girls that were still in the bathroom. If she can't get away from the bully, she needs to keep screaming and then attack like her life depended on it.
Because a bully like this will not stop until she is on the ground not moving. So surpise is key. She needs to know all the cheep shots on a body.
Poking and scrapig the eyes, biting to draw blood, pulling hair and spinnig herself around to rip the hair. Once the bully let's go or backs off, she needs to run to get help and medical attention for herself and the bully. This is assuming the school won't do anything to prevent it.
First talk with her teacher about it. Then the principal, usually the parents of the bully army even aware of their childs bad habits like bullying. But I stand by what I said before.
She needs to learn how to defend herself when she has no other option, like being cornered in a bathroom. Hope this helps, and good luck.
The school is responsible for children on and around the school bus. I would hold them accountable and insist that children be supervised. I would also insist on knowing why they are unable or unwilling to provide a safe learning environment for my child.
I do not consider bullying a mole hill, I consider it a mountain. I would treat it as one and make sure that the principal, the bus driver, the teacher, the superintendent and the director of transportation all knew, in writing, what had happened and that I was holding them accountable for any future incidences and that I expected them to take immediate action to correct the situation. There are many successful programs for dealing with bullies today, and I would want to know which ones they are implementing in their school to address the problem.
In short, I'd be a real pain in the neck.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.