Shoot a better video, have her dress atheletically & provide a better hitting environment.
Unfortunately, I have limited resources. We are in a garage, she is wearing sweats, and we live in Ohio, so it's not like it's warm. The garage is what it is. We rent, so I can't change where the workbench is or modify the structure in any way. I live in a softball dead zone, so I would have to drive 30 minutes and fork out more money to take her elsewhere. Right now, that is just not possible. I don't own a video camera, so the video on my phone is as good as it gets.
And you say her head is moving. Specifically, how do you propose to fix that?