The author, Eleanor Estes, uses Wanda's physical traits as a way to emphasize her uniqueness and resilience. Here's what we know:
* She is "different": Wanda is described as being "foreign" and having a "different name" than the other girls. This hints at her being an immigrant or from a cultural background different from the other students. This difference is emphasized rather than her physical appearance.
* She is "poor": We understand Wanda is poor because she wears the same worn-out dress every day and has to make her own clothes. This is used to emphasize her resilience and her ability to create beauty out of limited means.
* She is "quiet": Wanda is described as being quiet and shy, which is also a contributing factor to the other girls' unkindness. This again emphasizes her personality and inner strength.
The lack of detailed physical description highlights the story's focus on character, kindness, and understanding over superficial aspects like appearance. It challenges readers to consider people beyond their physical traits and instead focus on their personality and individuality.