For Esmé with Love and Squalor
Miss Megley is not the most effective governess – she's no Mary Poppins. She doesn't have much of a role, except to exert some control over when Esmé and Charles come and go. She's theoretically in charge of the two children, but that doesn't seem to mean much to them; in fact, they intentionally disobey her at various points in the story. It just goes to show that nobody but Esmé calls the shots, and it seems that she's bringing Charles up to be similarly bold.