Was the three year old traumatized? Was she held down, entrapped, did it hurt? Was she in danger of losing an eye or an ear, or getting permanently scarred, by trying to get away?
Who does this to a three year old? It sounds insanely abusive.
Tell that to the girl she made crank calls on threatening doing horrible stuff to her.
This time it was only a haircut the next kid may not be so lucky