Study spin axis!!!!!! Understand that there is a north-south pole with an east-west equator (this is a curve or screw) and then there is a east-west pole with a north-south equator(fast, drop, rise) The equator will be the stripe that you better have drawn on all the balls she pitches practice with!!! With out the stripe, reading spin axis is much harder. Once you understand this and how to achieve it, its all about overall mechanics with heavy brush trigger.