it's no help now, but when you see a situation like that, look for something neutral colored (white or grey) that you can use as a reflector. If you had help a white pillow up near her to reflect light back on her face, the shadows would be reduced. When you use a reflector, it is often best to get it as close as possible without actually being in the picture.
Nice picture though. Honestly, I like it as is. I wouldn't mess with it.