I was just sitting away from the field reading a book. I saw her hit one and her TB coach told me about the other 5.
A change up should be kept low so that if the hitter does time it, they have to make the secondary adjustment of going down to hit the ball also. 2 movements in the hitter doubles their chance of a bad swing. The combo of being able to read the pitcher's change up early and doing a backflip to keep it up in the zone is a deadly combo. - Bill Hillhouse