Carlos: You know who you are, Gaby? You're the kind of person who would have turned away Mary and Joseph from the inn.
Gabrielle: Well, they should have called ahead.
Gabrielle: I feel a wave of morning sickness coming on, and I want to be standing on your mother's grave when it hits.
Bree Van De Kamp: It's the age-old question, isn't it? How much do we really want to know about our neighbours?
Lynette: My babysitter joined the witness relocation program.
Answer: Kayla was sent away in episode 16 (The Gun Song) in season 4, after falsely accusing Lynette of child abuse. She now lives with her grandparents - probably Nora's parents.
I'm curious why we never see her again, why she never talked about, and why Tom never mentions visiting her.