Like many young hitters,her hands arms torso are starting to swing (move forward) well before she gets her foot down, I like the Go Drill but not fond of back knee turning towards the catcher part. Even if it does turn very slightly towards the catcher, I would not say that. I would rather have them feel as if the knee is stable and the back hip rotates (loads) away from plate. I like the Justin Stone video, too. https://www.youtube.com/watch?v=vLbpAoG_dgQ
Its a little longer but alot of good stuff in it.