What are the motifs in The Game by Diana Wynne Jones?

Belonging and Acceptance are recurring ideas in the book. Hayley initially feels like an outsider when she meets her extended family. She helps unclog a roof drain during a major rain storm and is immediately accepted into the family because she saved the old house (castle) from major water damage. Each trip into the mythosphere brings her closer to the members of her inner circle and they begin to trust her power and intuition. While younger than everyone else in the group, Hayley quickly becomes their savior and rescues them from the tyrannical Uncle Jolyon.