I vote "leap".
Sounds like the pivot foot did not push a second time after catching up to the foot she landed on. Had she pushed again off the pivot foot, then I would vote crow hop. I definitely agree with the others that it is not easy to determine what a step "simultaneous with the release of the ball" is.
Sequence (from your description; assume right-handed pitcher):
1) Pushes off rubber with pivot foot (right foot).
2) Both feet in air, left foot ahead of right foot.
3) Left foot lands and stops.
4) Right foot catches up to left foot, landing and stopping next to it.
(ball is released sometime at or between #s 3 & 4)
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bobbrix
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