You're kind of lighting this, well, a bit oddly. First, the two shoot-throughs on the right hand side, backed up next to that white wall...that is creating not really a fill light, but a "dueling main light". Your ostensible main light on the left hand side, the reflecting umbrella, is only one flash unit I assume....on the other side, you have two flash units, but as dark as her hair is on that side, I think the majority of the light is blasting right in FRONT of her, and NOT hitting her much...
You have the "fill lights" much too far off to the right hand side. And there are two of them...also, looking at the angle of the black reflecting umbrella and then her picture, it looks to me like the main light's main thrust is NOT hitting her face, but is instead hitting her shoulder pretty hard and hot, and thus her hair on the "main light side" is inky-black. The main light is not aimed right. Same on the other side with the fill lights--their aim is off, and the position is unorthodox [ie. wrong]. To me, I would say that the main light's aiming problem is caused mostly because the ceiling is too low, and the main light umbrella is too big for the room, so you cannot get it high enought to "rain the light downward" onto her face with her standing. Having her seated would alleviate the issue with the ceiling height and umbrella size,and allow you to aim it a bit differently than with her standing.
As to the main and dual-fill situation: why not try having one main light, and then put just one,single fill light RIGHT NEXT TO the camera,at the exact height of the camera, and aimed straight ahead, right AT HER. Not from off to the side. Right next to the camera! You want some shadowing to give shape to the face, so set the main 30 to 40 degrees off to the side, as you have it now. With the third flash freed up, you can use that to provide some hair lighting. Maybe bounce one flash off the ceiling, at 1/4 power or so.
You could also try using a shoot-through as a main light/hair light COMBO.... BY that I mean, do you see in the pic how there is some "raw" light hitting the ceiling from the right hand side umbrellas? Well...can you figure out a way to maybe get that light to come from the MAIN light, by using a shoot-through a a main light, and counting on the ambient spill to hit the ceiling, then bounce downward at hit her hair a bit?
This test session is a good example of why learning to light without modeling lights is so difficult for beginners...you cannot actually "see" what the lights are doing without shooting photos, AND without some amount of experience and training in how they actually do their lighting. Just based on experience, and looking at the scene, I can tell you that the shoot through umbrella on the right hand side, the one closest to the camera, is not doing much of anything helpful, at all. Anyway, keep at it. And get rid of that second "fill light", and move the fill back to the CAMERA position,aimed straight at her.