I'm always totally boggled by people bitching that Aurora cries after she finds out she's a princess. She's not even upset by that. She's upset that she found a companion (the first one she's had ever, apparently) and she was immediately told she couldn't ever see him again.

Also, I wouldn't say it's "girl kept in the dark for her own good". I think this happens to male characters almost as much, if not equally. In this case, I'd say the more common trope is "royal kept in the dark for own good".