Here is a video of Haley and my granddaughter 2 years ago working on leading with the barrel snap. Almost every time my granddaughter missed the ball she was late because she moved her body 1st. When she hit the ball, she started with the hands turning the barrel. This is not a scientific study just our experience. Remember both these girls are learning a new pattern, be kind and take it for what it worth.
First 2 swings by the older girl -- Her hands look static at the start of the swing to me. I see her turning her body first. What am I missing?