MECHANICS - MECHANICS - MECHANICS...your DD's goal IMHO should be the best mechanics possible for her body type and the ability to hit her spots with any pitch at least 75% of the time. DD increased 8 MPH over the last two years because of a pitching coach that stresses and reinforces solid fundamental mechanics along with her practicing at least twice a week and having/maintaining a personal desire to succeed. DD's increase in height and strength hasn't hurt either.