Pitching shoulder and hip rotation

Question
My daughter is 13 and pitches at about 53-55 mph. She can pitch to spots very well. She was just told by a pitching instructor that she does not get her shoulders and hips closed. The instructor told her that the hips and shoulders need to be in a perfect line with catcher during her wind up and prior to the release. i have watched her and agree that she does not do this but do not know what to do. do i try to change her? if so what drills would you suggest that she do? Any advise would be great.
Thank you
steve

Answer
I really don't like to speculate on possible solutions if I can't see the athlete perform with my own eyes. I also not sure I fully understand the question but I'll try to explain the basic motion.


When the pitcher strides this should open the ball side hip and shoulder. Basically her arms and legs form an X when she is fully extended (open). At this point, her foot is still in contact with the pitching rubber and her pitching hand has reached a one o'clock position.
With her momentum now driving her entire body forward her push off foot begins to drag on the ground; and she begins turning her hips back toward the batter. Bringing her hand through the one o'clock position and onto the 6 o'clock position is actually the downward power motion of the arm.
By the time her arm reaches the 6 o'clock position, the hips are once again are closing and facing the batter, and the push off foot has been dragged to a point immediately behind the glove side foot and with a snap of the wrist the ball is released.  

One drill you can try is to have her stand approximately 20 feet from a standing receiver. Have her stand in an open X position (stride foot already forward, pivot foot back) then without stepping, practice driving the arm down, snapping the wrist and at the same time closing the hips and 攑ulling?the pivot foot.  Do a couple of sets 20 pitches each practice.
The hips closing should be part of a natural follow through (i.e. not forced)