Phoebe plays an important role in the novel as a symbol of Holden's innocence and childlike qualities. She is a constant reminder of the world he is leaving behind as he journeys deeper into adulthood. Phoebe also represents Holden's hope for the future, and her faith in him helps to give him the strength to keep going even when things seem bleak.
Phoebe's character is central to the novel's themes of alienation, identity, and the search for meaning. Her innocence and optimism provide a counterpoint to Holden's cynicism and despair, and her presence ultimately helps Holden to find a way to reconnect with the world around him.