Mike, I also was trying to point out their posture compared to your players'. Check the shoulder levels. The 3 hitters I posted shoulders are all tilted towards the plate. This happens if a hitter starts out in a good athletic posture and rotates into the ball keeping that psoture as much as possible. (Think of a QB taking a snap from center as an example of good posture). Your player, I can only guess is a little too vertical at set up or comes out of a good posture by straightening up (Her shoulders are level to the ground). This can cause a "pulling off" or shoulder flying out issue, but it is really a posture issue.I guess it isn't a case of flying open and rather, as you said, being early. I'll have her start tracking - that sounds like a good drill. Thanks!