Unless she has an ongoing sponsorship deal with Cartier, magazine photoshoots actually pay very little money. Models do it for their portfolio. This article, with the accompanying financial statement, gives a pretty good idea of how much she probably made.
http://jezebel.com/5701608/exclusive-lawsuit-reveals-what-vogue-actually-pays-its-models
Well at the very least the pictures sure will be perty

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And she gets attention. Win - Win - Win, even if she doesn't get any money for the shoot. I also want to see those pictures!