Final answer:
Wendy's view of Peter's biggest pretend is not directly mentioned, but hints in the story suggest it revolves around the children treating the dangers of the nursery as mere fantasy when in fact they are quite real.
Step-by-step explanation:
In the narrative provided, Wendy's view of Peter's biggest pretend is not explicitly stated, and one must infer from their actions and dialogue.
If we look at the context and the events of the story, it might suggest that Wendy and Peter are pretending that the nursery, a room that materializes their thoughts into reality, is just a game. In reality, the nursery holds a more ominous role, which becomes evident when considering their parents' concerns and the eventual locking of the nursery.
Wendy and Peter's nonchalance about the dangers posed by their creations in the nursery could be seen as their biggest pretense, as they seem to ignore or reject the real threats in favor of their preferred reality.