thank you, I believe that to be the case for usWe go to a Tincher PC, I found you have to be careful with the 'princess hand' release thing (at least ours teaches that cue). It can lead to them focusing on the ending palm-down position, which can either lead to bullet spin or the change-up throw (in which they anticipate and pronate before release). I'm still working through the latter with my dd.
Take a slow-mo video to confirm if she's anticipating the pronation; my suggestion would be to de-emphasize the palm down cue, rather focus on a relaxed hand after release.