It is surprising to see that purple is one of the most popular colors for bedding with girls, not only teens, but the younger crowd. Pink has always been first for the really young, but as they get past kindergarten, they start to get more grown up it seems. And they want something maybe a little more modern, a little more "in" and purple seems to fit that mode.
Purple has a great history, actually, it was only used by royalty as they were the only ones who could afford it, based on the method it took to get that color. There are many shades of purple actually, and there is a soft purple that when mixed with say white, is very attractive for girls purple bedding. There are some great selections online.