Final answer:
Cannot confidently provide a correct answer about the character named Summer without additional context or information about the book or story in which she is featured.
Step-by-step explanation:
The question "How is Summer different from the other girls in fifth grade?" seems to have been misunderstood in the provided reference information. It appears that the question might be related to a character named Summer in a particular book or story, as opposed to the season of summer. In the context of what has been provided, the references are speaking about the actual seasons and daytime length or about the characteristics of different individuals in social settings, but nothing specific about a character named Summer. Since none of the information provided is relevant to answering the initial question related to a character named Summer, we cannot confidently provide a correct answer without more context or information about the character and the book or story in which she appears.