How did the girls know that Wanda liked them even though they had teased her?

How did the girls know that Wanda liked them even though they had teased her?

Answer: After getting letter from Wanda, the girls came to know that Wanda liked them even though they had teased her. She had asked Miss Mason to give the green dress to Peggy and the blue one to Maddie. When Maddie looked at the drawing very minutely, she realized that the dress had a face and a head, which looked like her own self. That is why the girls knew that Wanda liked them even though they had teased her.