lately she is.. I believe her chin, head, shoulder popping up is because of the overactive oblique. But trying to break her of the habit is very challenging, so maybe a simple cue like keeping the chin down will work. And by getting under the ball I mean clipping the bottom, just getting a piece, and clipping the ball. not a solid mile high pop up.The swing isn’t bad...a lot more good than bad.
The chin lifting & back shoulder dipping slightly is probably the issue with not barreling up the ball.
She is pulling off the ball to generate velocity rather than staying down. By lifting the chin and leaning back in the swing she is probably having a hard time centering the ball. Most of the folks I see that do this tend to get under the ball.
Is she popping up & fouling back a bunch? If I’m correct. If you can get her to stop pulling off she’ll start driving the ball. Start with keeping chin down, the rest will likely fix itself.