My personal opinion is that your DD should be swinging as heavy a bat as she can hit with . As my DD has been working with her batting coach improving her form the heavier bat doesn't seem to be a big deal for her to swing . My DD is 5'3 and 125 pounds and when she was using her Rocket Tech 31/22 she was absolutely hammering the ball in the cage . Unfortunately its not nearly as sexy as her 31/21 CF5 Demarini sent her to replace her cracked CF4 so it sits in the bag getting ignored . As soon as we go outdoors I am gonna make her use the Rocket Tech again just to see how much further she can hit with it as thats probably the only way I can get her to ignore the fact that it looks like the graphics were designed by a 13 year old boy