>>> I have a player that has incredible bat speed however is on her front side too much and pulls off the ball way too much. The change up eats her alive. Does anyone have a suggestion to have her have a more controlled swing? <<<
The bat speed that counts is the speed attained in the contact zone. I find that most of the videos of hitter's swings sent to me for analysis show their maximum bat velocity occurs well after passing through the productive contact area. Below are a couple articles I wrote on this subject that may address the problem you describe.
Does bat speed = Pop?
Pulling off the ball