I would seriously blow up if I had two ugly, mean stepsister ripping my dress (esp one that belongs to your deceased mother). I wouldn't care about getting thrown out or losing the fight against two girls but that would be the boiling point for me. I would have ripped their dresses back too because if I can't go to the ball then they can't either.
I hated this scene when I was a kid:
Most Helpful Girl
Yeah I just would leave the house!1