Thread:LockAndKey989/@comment-43279580-20200930154004/@comment-44975735-20200930191934

I think that the impact of the book is visible in the sequel but it's mostly visible in interaction between Anna and Elsa. Anna in Frozen II had a lot of understanding for Elsa, which is something she built during the story of the book.

Quotes you mentioned fit Elsa even after that. If a thing isn't mentioned doesn't mean it isn't there somewhere, especially if it's substituted by something similar.

Anna's nightmare happened right after the incident and at that point, Anna and Elsa were already separated. Anna also explicitly mentined this at the end when trying to put together the story. Elsa started loosing control of her powers after the incident, which is also when the trick came into play.

That other extended media doesn't try to be part of the main story and tries to represent something random. Due to that, I would rather trust FOS. Also remember Elsa is a mastermind when it comes to keeping things secret as well as well as hiding back facts she already presented at some point.

This has a lot to do with her well known and complex personality. Trust me, I know a lot about it and there are more that a few things that you would consider impossible, extraordinary or at least unexpected. Of course none of this is 100% as it happens but it always ends up lining up after a bit of thinking. Disney did a really good job in this area in the movies and FOS easily matches it.