I think Disney underestimated how many girls (and women) feel like outsiders. Elsa's character really isn't well developed. Nothing like Anna's, but we just relate to Elsa.
I don't buy this reasoning. Think about it. Aren't most if not all of Disney's heroes/heroines outsiders?
We have:
Ariel
Simba
Belle
Tramp
Cinderella
Hercules
Mulan
Snow White
Bambi
Pinocchio
Alice
Dumbo
Aladdin
I left some out because It either wasn't quite as obvious or didn't apply.
Just looking at the princesses Belle, Ariel, Cinderella, Snow White and Jasmine. They are all "outsiders" that overcome their issues or origins...
Disney sometimes is too focused on the $$ to know their audience...

I think Disney underestimated how many girls (and women) feel like outsiders. Elsa's character really isn't well developed. Nothing like Anna's, but we just relate to Elsa.
I don't believe Anna deserve to have Kristoff. I am upset that the writers made Anna look so bad----and I wanted to like her. I like Elsa's power more than anything else and she seems nicer than Anna. Anna was more than ready to trash their relationship for a guy she just met two minutes before. Frozen is all about Anna...but it's strange that I want to know more about Elsa. 

) but as far as things the protagonists do when they're stressed, I think Elsa refusing to come down the mountain and at least try to unfreeze the world was a bigger offense. I like that both the heroines are flawed people who are working through their problems.