How does this look?
I just played with the hue/saturation layer. The trick is to: a) use red dropdown, b) select overly red skin with left eyedropper, and c) select good skin (the girl's skin) with the minus eyedropper. Then shift hue to the right past zero. You might wish to adjust yellows as well.
This process is outlined in more detail in the following book:
Amazon.com: Skin: The Complete Guide to Digitally Lighting, Photographing, and Retouching Faces and Bodies: Lee Varis: Books [sponsored link]
I've done this quickly to show the idea. I am sure with more deliberate attention, the results can be even better.