This reminds me of my childhood and being told that I couldn’t possibly understand things that I very much did understand, often better than the adults pillorying me did. Children – even ones not as wildly precocious as I was – understand and realize far more than most adults give them credit for.
Even if you aren’t reading Moby Dick when you’re eight, most kids are extremely perceptive about their social milieu and what’s expected of them. Girls especially get told how they should be, and who they should be, more often and more forcefully than boys do.
I suspect that girls of the age 7-13 understand a lot of the messages in Frozen better than adults watching it do (if many of the adults understood it, they probably wouldn’t let girls watch it).