What to do with aggressive filly?

If she were mine, I would turn her out with 2 or 3 other mares and let them work it out. She sounds like a horse that is totally unsocialized and is disrespectful and dominant. She has no manners and the other older mares will teach her some life lessons. If there are a few cuts and bruises, they won't be life threatening and the lesson would be worth it. I would not put her into a situation where she could hurt herself, like in the stall since she is so out of control. Without some herd interaction to remind her of the hierarchy of horse life, things are unlikely to change relative to horse relationships.