Illegal pitch or not?

[DaveASA/FED]

Would you rule this illegal or not? Pitcher standing on pitching plate right foot on plate, left foot with toe 1-3" behind plate. As she is getting ready to pitch she brings the toe into contact with the plate and IMO is totally legal from there. The timing of this is very close to when she is bringing her hands together to start the pitch. She is not pushing off from behind the plate, or stepping back, she even stops as she gets the foot to the plate. Would you call this illegal??