HORRENDOUS ADVISEYa. I'd say ditch the tee besides warming up. And instructors too. Throw her a bunch of front toss(take the instructor money and rent cages if you want/have to). Or tennis balls in the back yard. Nothing to coach there I don't think at this point. She also doesn't drag it which is really nice.
The tee is where young athletes learn WHERE TO HIT THE BALL
Now you do need to move the t back in her stance...That will also help with fwd arm plunge that she has going on.
AGAIN.....LEAVE HER ALONE!