Great video! I would go back a little with the soft-box so the light falloff will be smaller. The light on her seems to be a bit too intense and too harsh. I prefer a more balanced shot, the subject being just a bit more exposed than the background.
There's not much difference in background exposure, the main difference seems to be color temperature and/or exposure on her face. Is the color temperature the same in Lightroom on both images? Is the flash/modifier adding a color tint?