My female teammate is a backup bowler righthanded with good ball speed, throwing 15 lbs. Her roll on the ball resembles that of a full roller. Her setup has her holding the ball with her thumb @ 1 o'clock. I have attempted to get her to hold the ball with more of a suitcase grip and let her pushaway get her hand into a more natural position, to no avail.
Looking to get her some new equipment / drilling which would help give her a little more sideroll and open her area up a little. Any suggestions or thoughts.