Why is Maddie embarrassed by the questions Peggy asks Wanda? Is she also Wanda, or is she different?

Maddie was embarrassed by the questions Peggy asked Wanda as she herself was a poor girl. She used to wear old clothes given handed down by others. But she was different from Wanda as she was not as poor as her and also had a few friends in the class. Maddie considered herself to be different from Wanda in the sense that she would never claim that she had a hundred dresses. Yet she was afraid that others might make fun of her too.