It's very simple. Just this Channel Mixer layer:
Red +100, 0, 0, +10
Green +93, 0, 0, 0
Blue 0, +100, 0, 0
Then mask it on to the background. You'll be SO pleased to see that you don't need any precision at all around her hair - just let your mask blend gently into the edge of her hair. The same with her shirt.
The only place you'll need precision masking is around her face. Make sure you zoom in, and use the Shift key. Once you've done it very accurately around the edge, switch to a 10% opacity brush, at a bigger size, and gently mask onto her skin a bit, to remove the pink cast that's on the side of her face.