Maxwell hasn't arrived to open the bookshop, yet the bookshop is open for business.
Ruksy says Peter can see her because she's allowed him to, suggesting invisibility to humans is a natural state. If so, Peter shouldn't have been able to record Darra vanishing in an earlier episode. This wouldn't be Kyra's state, however, as she's human, and her interactions with Darra, Imogen, Lily and Ruksy should often appear as Kyra talking to herself or schizophrenically to people who aren't there.
Kyra and Ruksy explain to Peter how the magical world wants to remain hidden, loudly, in public.