Why does Mrs Kennedy refuse Mrs Johnson and offer to help to change her clothes?

Mrs. Kennedy refuses Mrs. Johnson's request because she likely feels that Mrs. Johnson's situation requires a more careful and respectful approach than simply providing clothes. Instead, she offers to assist Mrs. Johnson in changing her clothes, which suggests a more personal and empathetic support, recognizing the importance of dignity in the process. This response reflects Mrs. Kennedy's desire to maintain a sense of respect and care in their interaction.