So about an hour away from Grandma and Grandpa’s, Edna’s parents explained: they’d given it a lot of thought and that something would be for Edna to spend the summer in the desert with her grandparents, starting now.
-- Narrator (Chapter 1, The Cure paragraph 21)

Importance: Unhappy with Edna’s rebelliousness, disrespect, and spoiled nature, Edna’s parents decide that a summer with Edward’s parents will do Edna some good. Here, the entire foundation for the plot of the novel is revealed as Edna’s nature leads to her having to spend the summer with her grandparents. Edna is angered and annoyed that she will not be able to spend the summer the way she wants to, but this serves to be a foundation from which she will grow.

You’re going to shape up this summer, Edna, and that will not include reading all day.
-- Grandma (Chapter 3, Edna vs. Grandma paragraph 19)

Importance: Edna’s early attempts to outdo and one-up...