What important decision did Maddie make? Why did she have to think hard to do so?

The important decision that Maddie made was that she would never stand by and say nothing again. If she ever heard anybody picking on someone because they were funny-looking or because they had strange names, she would speak up. She did not even mind losing Peggy’s friendship over it. She knew she could not make things right with Wanda. However, she had decided that in the future, she would never make anybody else unhappy again.

She was unhappy that she could not find Wanda at her home. She could not sleep that night. She thought about Wanda, her faded blue dress, and the little house she lived in. She also thought about the hundred glowing pictures, which were all lined up in the classroom. She was feeling guilty of not having said anything when everybody else was teasing Wanda. It was her guilt that made her think very hard and arrive at the important decision.