We thought she was a superhero already, but now she’s taking the job literally—in Princess Power, Barbie is donning a cape and mask and taking flight.
Princess Power is a whole thing, including dolls, animated shorts, online games, the whole works. In the animated shorts, Barbie goes for a more subdued look and goes around using her estimable powers of flight and friendship to make days a little brighter (I’m assuming the crime fighting happens off-screen). In Super Sparkle doll form, though, Barbie goes all out with a hot pink dress and pink and purple sparkly cape. There’s even a Ken reporter doll to really round things out.
Anyway, this whole thing apparently came about because Mattel did a survey and found out that girls like princesses and superheroes equally, so they made Barbie into a princess superhero. I’m not sure a study was really necessary, but hey, whatever you need to do to arrive at the obvious. You could just look at the world of comics if you had any doubt!