Slow down the machine so that she can concentrate on mechanics. It will take time. Think of it as a more accurate soft toss that does not blow up daddy's arm. Keep taking vids and showing her. She needs to see what she's doing as well as feel what she should be doing. Have her diagnose herself and add in your thoughts when needed. You may be surprised how quickly she self corrects.
Then when she has a good handle on everything you turn up the machine a little and begin again.
Then when she has a good handle on everything you turn up the machine a little and begin again.