Julia was in 6th grade and had been at her school since kindergarten. Her two best friends were Wendy and Erin. Erin was the most popular girl in the class and all the girls saw her as the leader. One morning Julia arrived at school and Erin was acting weird. When Julia said hi to her, she didn’t respond. She just looked away and smiled at a group of girls in the corner of the classroom. It didn’t take long for Julia to figure out that Erin had turned most of the girls against her. But she didn’t know why! She went to Wendy and asked her why Erin was mad at her. Wendy acted nervous and said that all she knew was that Erin told her that if she hung out with Julia, none of the rest of the girls would talk to her anymore. The rest of that day lasted forever. Whenever the teacher was looking everyone was nice to Julia. But, when her back was to the class, Erin or another girl would throw pieces of paper toward Julia or whisper to each other and look in her direction. Julia thought Wendy would help her but Wendy just pretended nothing was happening. That night Julia talked to her parents and they told her to wait and see if tomorrow was better. If not, they said, perhaps they could help Julia talk to Erin and work through the problem.
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What is the main problem?