I was hoping for a bit of anatomical info. Maybe how to suspend things.
What I see is her sinking into the flex of the front leg, but not letting her head/weight get ahead of the rear hip or lose her scap pullback. Being able to maintain her position over the rear hip while waiting on the ball means she can still execute the swing mechanics that work best for her. When she allows her head/weight to get ahead of the rear hip at launch, things don't work well for her.