At the beginning of chapter 5, we see that Jem, Scout and Dill are still trying to find a way to find out more about Boo Radley. Jem has come up with the idea of creating a play about the history they think they know about Boo's life, but when Atticus finds out, he tells them to stop. Scout is getting tired of always thinking about Boo and wants to do other things. However, Jem and Dill still want to continue their playing. Dill follows Jem around all the time and Scout gets easily annoyed with him because of this.
"Dill was becoming more of a trial anyway, following Jem about. He had asked me earlier in the summer to marry him, then he promptly forgot about it. He staked me out, marked me as his property, said I was the only girl he would ever love, then he neglected me. I beat him up twice but it did no good, he only grew closer to Jem. They spent days together in the treehouse plotting and planning, calling me only when they needed a third party. But I kept aloof from their more foolhardy schemes for a while, and on pain of being called a girl, I spent most of the remaining twilights that summer sitting with Miss Maudie Atkinson on her front porch."
Dill and Jem are becoming closer, and that really irritates Scout. She is feeling left out, like most little sisters do. She wants to be a part of something with Jem and Dill, but does not want it to be about Boo. Scout is upset that Dill has chosen to spend his time with Jem rather than chase her around declaring his love for her. Scout doesn't want to disobey her father, either. Atticus had sternly told the children to stop making plays about Boo and his family, yet Jem and Dill still wanted to do it. Little does Scout know that there are far more serious and dangerous things to come, and she will look back on these innocent times and think of them fondly.