In watching the women around her, the way they carry themselves and the way they handle adversity, Scout is finding being a girl a bit more appealing. When Dill declares his love in a letter, Scout doesn't consider his proposal as something better than his presence. He was simply a part of her life.
Dill concluded by saying he would love me forever and not to worry, he would come get me and marry me as soon as he got enough money together, so please write. The fact that I had a permanent fiancé was little compensation for his absence: I had never thought about it, but summer was Dill by the fishpool smoking string, Dill’s eyes alive with complicated plans to make Boo Radley emerge; summer was the swiftness with which Dill would reach up and kiss me when Jem was not looking, the longings we sometimes felt each other feel. With him, life was routine; without him, life was unbearable. I stayed miserable for two days.