Thinking back and even allowing for a certain amount of precociousness, the little girl did seem a tad unbelievable in her grasp of the situation and her ability to understand what she was reading/seeing in the grown ups. That said, I suspended my disbelief while reading (where it mattered) and so truly enjoyed the story. The idea of such a magical trap- great. The characterization of Harry and Draco as seen trough a stranger's eye- great. The ending- great. No, Perfect.