...You don't have the correct exposure on your subject. You didn't mention where you had the 6' softbox placed, but with six feet of softbox you should be able to get a constant reading from head to toe(including the floor), but keep in mind that the center of the light beam(for lack of a better term) will be hotter than the edges, and whatever is closer to the light source will be hotter.
For example, if you want to place the light higher than the camera, like what was suggested in a previous response, aim the light at her feet or knees, it will take a little experimenting. The hotter light, from the center of the softbox, will have further to travel, and the light from the edge of the softbox, which isn't as hot, will have less distance to travel, and should even out your exposure, overall. Like I said, it will take a little experimenting.
In addition to the distance items, mentioned in other responses, try this. It looks like your background lighting isn't balanced. Turn off the background lights and get the exposure on your subject the way you want, as described above. Then meter your background lights, individually, with the meter at the background, aiming toward the light. Set them for two stops hotter than your main light. Then meter them both together, with the meter aiming at the camera. It should be close, or a fraction of a stop less.
We'll be looking forward to the results.
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