I havent read the bazillion posts on this thread but the main most obvious problem is that she is way out front. She doesnt let the ball travel and all the mechanics have already gone to crap.
If this girl let the ball get deep she'd be putting the barrel on the ball using her core muscles not the wrist and weaker hand muscles.
She has improved a lot. A big bunch! The difference of opinion in these 500 posts has been the "barred" (straight front arm and when to start the barrel release, or wrist snap). Hitting the ball deep we all agreed with.