Crow Hop?

[For the kids]

I covered this on my Base on Balls Thread but curious if anyone that hasn't read it would like to share their opinion. We have a girl in our 10-12yr old league that pushes off the pitching plate and leaps. Her release point is from where she is landing and after she lands--about 2-4 feet in front of the pitching plate depending on which hole you measure from. There are definitely 2 holes from where she was landing and no sign of a drag between the pitching plate and the first hole. After one game it had rained and the holes where she was landing had filled up but there was no trough between. Even though girls in the 8th grade+ league have been called this girl has not. They do use more experienced umpires for the older league. Is this a legal delivery? Is their anything you can do if the umpire won't call it? She can be quite wild and has knocked girls right off their feet.