Board Thread:Questions and Answers/@comment-44975735-20200305170443/@comment-44975735-20200411092422

I now think that it's the former as well. No one knew at that time that Elsa was supposed to be the fifth spirit because this information was provided by "Iduna". On the other hand, Anna said before that that "If anyone can resolve the past, if anyone can save Arendelle and free this forest, it's you.".

I would not take the the fact that someone was born to do something too literally.

I watched the movie a second time and found that all of the spirits were helping Elsa and pushing her to do what they wanted her to do. Nokk, however, saw that she is going to go too far and tried to stop her.