Phoebe is the force of redemption in the story. She represents the quality of Eros, or the life affirming force. This is importance because there are not many other examples of a Eros in Holden's narrative. If I were to add an element to the narrative, I think that I would be interested in seeing an ending scene where Phoebe visits Holden in the psychiatric hospital. Phoebe seems to be the one person where Holden can actually communicate and feel emotions that are divorced from his venomous approach to the outside world. I think that it might work to have Phoebe actually talk to Holden in the hospital about how he feels and, specifically, their own relationship. If Holden is going to get help and actually mature into his own person, it will have to start with his love for Phoebe. In this light, integrating her into the ending would be something that I could consider seeing. Yet, in the end, this novel is so perfect in how it was constructed that there mere idea of wanting to add something is far beyond anything I could ever derive.
I would rewrite the scene in which Holden sends a letter to Phoebe. The reason I would do so is because I had always been curious as to how Phoebe reacted when she read about her brother planning to run away, and just how much ideas/ thoughts went through her mind as she made the choice to walk back home and pack her stuff, in order to run away with her brother.