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I see the restriction of space you have, tough one to deal with. Imo, I would put the camera directly facing the curtain, with you and her centered on the curtain. Move the umbrella to the left side, about 45 degrees, about the same height, face level. The beauty dish just over my right shoulder, almost at the top of my head looking slightly down upon you and her, looking from the camera (catch light). Raise the camera to at least eye level, kind of split her's and your height. Oh, and take a step or two towards the camera away from the curtain, for shadowing. You can expect to get light bounce from the small wall sticking out, back onto the side of the face (acts like a reflector), and may need to throw something reflective on the floor to lessen shadowing under chin.
I would start there fwiw. Keep it up guy, only way to learn is try things.