Why do you presume that? There's no basis to think that.
Also: If Disney already has a dozen sparkly girly princesses, adding one with a different target market should expand their customer base. Adding another to the same group might just cannibalize sales of other existing sparkly princesses.
Because I spend a lot of time with her. Mostly at the hackerspace teaching her what a 3D printer is, how to make an arduino blink faster, and how to design files so that I can laser cut them.
Also: If Disney already has a dozen sparkly girly princesses, adding one with a different target market should expand their customer base. Adding another to the same group might just cannibalize sales of other existing sparkly princesses.