I think this is more of a natural IR finish than a forced palm down.I don't think her motion is "finished" in any of your pictures (see below of her in a game). She was taught HE... but she still pitched with IR, because it is a natural motion, and doesn't really need to be taught. As soon as someone taught her to be palm up at 9 o'clock, she had IR. Perhaps if she had been allowed to finish naturally, she would have finished palm down...
The OP is trying to choose between HE and IR, like they are mutually exclusive... But HE is a finish, and IR happens before release.
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I am not sure why everyone is arguing with wheresmycar. IR is indeed a natural occurrence within the entirety of the pitch which is allowed to occur based on other mechanical factors (e.g. palm up at 9).
IR is not a way to pitch, it is something that needs to happen with the arm during the pitch. An elite level pitching motion contains many mechanical factors that should be happening (good drive, 45 degree foot, good FSR, bent elbow/loose arm, palm up at 9, IR/brush).
IR is a coined term now for a way to pitch but it is out of context. It's only one part (although extremely important) of the entirety of the pitching motion.