I think that you set out to do really great pictures, but they just didn't turn out that way. It's just like Tyra Banks always tells her models, (lol) it's not always about being sexy. Some girls just happen to come off that way in pictures, rather they mean to or not. There is a fine line between pretty and sexy, and the middle ground is just hard to find sometimes. I think that's what the problem is here. You guys didn't mean for things to come off as so sensual, but to some other people it's just BAM HEY there's a girl giving me a SEX FACE. For one, she does NOT look 14. She looks much older, she's wearing much more make up than I ever wore when I was that age, (even if I was in a photo shoot), and it is dark make up. Which isn't necessarily a bad thing, it just makes her appear older and thus more of a sex-object.
If I were going to photograph a 14 year old girl my first thoughts would have been "cutesy" all the way. A lot less make up, perhaps none at all, maybe some pink nail polish, flowers, et cetera. Perhaps not even wear the uniform, but have a Flag dress instead? Or perhaps had a sun-dress, and wore the uniform over that. Something more cutesy.
However, I do understand if you were trying to make her appear older and whatever... Today's world is quite frightening in that aspect, and I'm afraid for humanity.