Why does she tell Mrs. Linde this story?

Nora’s skewed vision of the world is most evident in her interactions with Mrs. Linde. Whereas her old school friend is wizened and somber, Nora is impetuous. Her choice to tell Mrs. Linde about her secret seems to be more the boast of a child than the actions of a thoughtful adult, and Mrs. Linde also refers to her as a child. Nora’s naïve view of the law—that the law would not prosecute a forgery carried out in the name of a good purpose like love—reinforces the idea that Nora is fundamentally unaware of the ways of the real world.