I has believe having the rear elbow get into the horizontal position during the 'load' helped my DD.
http://i48.tinypic.com/9u
vpl5.gif
Practice getting into this position then 'right to ball'(Command Drill) at go...no, none, nota 'slop'. Just Gooooo to 'launch' swing.
I tried this and getting the elbow into the horizontal position does not work. She can still pull the elbow down and lead with it as her first initial move. Im glad it worked for you! Im looking for something that can nix that action as er initial move. I have tried a lot of different things. Hard case for sure!