Actually, whoever dismissed her idea and want of a "black princess" is immature.  It's not political correctness, it's wanting someone from her demographic.  Which brings me to an idea.  You know, in almost every culture, there's some ancient version of the Cinderella story.  When I was small, there was this piece of children's literature, an award-winning picture book about an Africa version of the story.  It was very good, even better than the European version, which is why I think it got so many accolades.  Anyway, that would make for a great Disney movie!  Writers should start pitching it to Disney.   

   Anyway, Princess Kida is arguably black, however there's two criteria for being a Disney Princess: 1.) ability to capture the heart's of little girls and 2.) her movie's financial success.  Thus, they have to exclude Princess Kida and Princess Eilonwy.  We sort of throw out Nala all together because she was really a background character and she isn't exactly glamorous.  Pocahontas has been the seventh "player" for some time now, but she's usually missing in action in group photos.  As for Mulan, I think her current rank could link her to the royal family and while she may not be an actual royal, she could have the title of Princess of China, which just means she's very important.