I will totally own it that the main reason I used Lady Middleton for that minor role instead of Emma or Mary Crawford was her age. I was all "okay, what female Jane Austen characters of presumably their late twenties/early thirties could I conceivably picture schooling an impressionable Baby Lesbian Caroline?" and while I could totally see how you could have Emma or Mary Crawford getting it on with Caroline, they felt too close in age somehow to provide the Mrs Robinson role for her.