Mrs. Gill lived next door to Nita. Every afternoon, Mrs. Gill took a walk. She said it kept her young. Nita liked to peek out when Mrs. Gill came back. Mrs. Gill was always happy after her walk. She often showed Nita something she had found, like a bright red leaf. One afternoon, Mrs. Gill looked sad. Nita asked her what was wrong.
Why did Mrs. Gill take a walk every day?