Hi guys,<br/>I don't understand the meaning of the following bold sentence.<br/>Could you tell me what it means?<br/><br/>“She’s not being silly at all,” said Peter, “she’s just making up a story for fun, aren’t you, Lu? And <b>why shouldn’t she</b>?"<br/><br/>(in chapter 3 of “The Lion, the Witch and the Wardrobe" by C. S. Lewis.)<br/><br/>Thank you.