Final answer:
The question asks for an analysis of a character's change in a short story by Nicola Yoon, but the provided references do not match the author or her work. Without specific details on the story or character in question, a general discussion on character development within the context of a short story's structure is offered.
Step-by-step explanation:
The student's question appears to be asking about character development in a short story by Nicola Yoon. However, the provided information discusses different texts and authors, such as Sandra Cisneros, Kate Chopin, and general principles of analyzing short stories. Unfortunately, the background information given does not pertain to Nicola Yoon or the way 'x' changes in any of her short stories.
Therefore, it is impossible to provide a specific answer on how 'x' changed in Yoon's narrative without additional context or information about which of Yoon's stories is being referenced and the character or element represented by 'x'.
However, in a general sense, character change in a short story often revolves around the development driven by plot events. The structure of a short story, typically featuring a concise plot over a short time span with fewer characters, leads to an intimate focus on character transformation, a critical turning point, or pivotal climax that catalyzes a character's change.