Julray, I am a bit short on time and will be until sometime tomorrow. Hopefully some others can chime in. Some of the responses you received were in the ballpark imo.
View some high level hitters. Take note that the lead shoulder becomes elevated. The movement of the lead lat will/should translate to the lead arm essentially being pulled. Your daughter increases the height of her lead lat by essentially standing up. View the pros while focusing on the torso/hip-engine ... sort of a twist-up ... not a stand-up.
All good 5frames... I appreciate your time and comments. Thanks again!!