One of the problems with it for women in that age range is that they are already being sold the idea of being 18-20 forever based on the ages of the models. That's had damaging effects (fear of aging so extreme that we see people getting plastic surgery before any cell degradation occurs or even before they've finished growing into an adult), and with fashion turning it's covetous eye on even younger models and actresses (Elle Fanning, Chloe Moretz, etc) and giving them covers and editorials it projects that it's not just youth that's the ticket, it's pre-pubescence. This creates a problem in that what their target audience is being told is desirable is completely impossible to attain.
I also believe that this practice of presenting children in adult magazines, of making them the next new coveted thing, encourages people to look at them with a less than wholesome eye no matter how age-appropriate the editorial is. Similar to the way there was a countdown going on the internet for when the Olsen twins turned eighteen, being in the public eye threw their sexual development and approaching maturity into the public consciousness and I don't believe that's healthy.
My third point is that even if this girl has the best management in the world and people looking out for her at every turn, modeling is a dangerous world. Girls as young as she is do not have the emotional maturity to deal with it the way it is--sexual harassment and proposition, not being paid by clients, being taken advantage of by agencies, traveling alone, these are all elements of the industry and many models will say that they wish they had been older in order to deal with these problems more effectively.
Hope this answers your question, I didn't really want to go off on a rant so I hope it doesn't seem that way, but I have strong feelings about these issues.
