The primary change can be seen by looking at the very start and very end of the story. At the start of the story, Connie knows she is pretty, and she experiences this as validation and power. After all, "she knew she was pretty and that was everything." At the end of the story, her beauty is vulnerability. It is what has drawn Arnold Friend to her, and may kill her and her family. Therefore, her beauty and the change in her relationship to it is very much tied in to the themes of the story.