Speaking ASA...
ASA is considerably less clear on this than is NFHS, but even so, you said,
Quote:
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...ending the pitch with her pivot foot outside of the 24 inch plate...
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Once the ball is released, the pitcher can put her feet any darn place she likes. I'm visualizing the ball is leaving her hand as she is bringing her pivot foot wide of the 24 inch plate.
Given the severity of the illegal pitch penalty (with runners on base, anyway), unless this was clearly in advance of the ball being released, it seems like a pretty picky call to me, especially if this was ASA.