Her biggest issue is not involving her lower body she is basically just rocking back and then letting go forward with upper body.
There is no load/coil with the lower body even her upper body tilt is only minor rock back.
Even though from the upper half it looks like she has a good powerful swing if you look slowly in the video it is almost like she is just standing there and swinging.
I don't think it will take a whole lot she just need to start using her lower half.
She thinks she's coiling and most of the time I think she's coiling so I wonder if she just didn't put quite the effort in it cause she was worried about the video. Then again...this may be what she always does. I know she's usually trying to feel the pressure on the leg/knee/foot basically trying to externally rotate without the foot/knee moving. Her rear hip does rotate/coil but is it still not enough?