Originally Posted by SystemicAnomaly
Seriously, have her give up the windup completely for a while. Not even an abbreviated takeback. Have her start with a proper trophy as I suggested. From there, make sure that she performs a decent racket head drop -- with no waiter position. Legs should straighten as the racket head drops and should be fully extended at the bottom of the drop.
If you can get her to accept this modified serve for a while, it should be much less frustrating. Who knows, she might stick with it permanently as some elite servers have. Or it could be a good stepping stone to an abbreviated takeback motion. Your first goal should be to fix the trophy and the timing of the racket head drop.
PS - You might try her with a 26" frame for her serves for a while -- even if she can handle the full size racket on her groundies.
She will try your suggested motion tomorrow. I understand what you are trying to say. Her and I watched the Agassi serve you linked.
She currently uses a 26inch head youtek junior racquet