Lucia wakes earlier than her mother, and she's the Contesa
So there's absolutely no reason why she shouldn't go out and explore Westcrown before the convention. Especially as she can fly on her own thundercloud (5 feet off the ground, but still. It makes her look absolutely terrific).
So the next morning, while her mother is still sleeping, she leaves, telling the new servant that she'll be back in the afternoon, and swoops away.
So Exciting!