Juliet writes to Sidney and thanks him for his visit. She says that Kit loves him mostly because of the book he brought her, Elspeth the Lisping Bunny. She's taken to lisping all the time. Juliet assures Sidney that he didn't see the best of Dawsey, as Dawsey is preoccupied with Remy at the moment. She also asks what Sidney said to Isola, since Isola recently berated her for not telling her about Pride and Prejudice and other, better love stories.
Isola presumably is comparing Pride and Prejudice to Wuthering Heights and Heathcliff; this shows that like Juliet, Isola is also developing healthier ideas of what romance and a relationship should look like. It's also worth noting that Elizabeth Bennett from Pride and Prejudice is a great book lover, like Isola and Juliet.