The Question and Answer section for The Lion, the Witch and the Wardrobe is a great resource to ask questions, find answers, and discuss the novel.
I think we have to look at this from a child's point of view. Wardrobes certainly are not traditionally some thing to be afraid of. Lucy was simply trying to hide from her siblings and found something curious. She is a naturally curious child so...
You can check them all out at the GradeSaver link below: