I think your idea should soften the light and make the shadows less intense...and possibly bring out more detail in her hair. Maybe even get in a little tighter on the shot because that will let you move the reflector in a little closer without getting into the shot. And don't be afraid to do a bit more post-processing in the image to make it pop, with a little skin smoothing. Women typically don't mind it when you make them look even better (unless you go too far so that they don't recognize themselves - then they get really mad!). My only willing model is my mannequin, and I think my wife's been jealous of the mannequin ever since I bought the blond wig....