Molly gives some cogent points on the shitty role models teen girls have today. However, there are magazines that aren't totally terrible for teens. For example, BUST occasionally drags out those shitty role models, but mostly focuses on women doing rather than women appearing. (because of frank sex talk, it's for over 16s or so). For lovers of crafts, there's Readymade. For younger girls, there is New Moon magazine(full disclosure- I had an article published in New Moon some years ago). Also suitable for girls under 16 is blackgirl magazine. Of course, the best way to know what magazines a young girl wants is to tailor them to their interests.