Who is the narrator, can she or he read minds, and, more importantly, can we trust her or him?
First Person (Central Narrator)
Usually, we can identify a first-person central narrator because she's using I, which is exactly what Georgie does. There's absolutely zero question that this is Georgie's story, and Georgie tells us what's happening to her both as it's happening and in flashbacks. The whole thing is one hundred percent from Georgie's point of view, complete with her own interpretations and prejudices. Georgie is both the main character and the narrator, which adds up to her being the central narrator.