She does not push off a second time on many of these pitches. You really need to look at the knee to make a good call. In many of these pitches the knee continues forward and the foot kicks out. On a few you can see the second push. Also be careful looking for that hole as suggested earlier. That hole is made just the same with the kick out of the foot.
IMO you really need to think about the leg mechanic when determining if this is an illegal pitch. If it remains straight I have nothing. If it bends and straightens out I have an IP.
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