How do your spouse/kittens choose their beds?

My daughter is playing Wildwood Story and just married Elli. She put in a second bed in her den, but Elli went to sleep in the first bed. My daughter is now DISTRAUGHT. (She is seven years old and lucky to live in a world where this ranks high on the problem scale.)

I'm wondering what the in-game logic is for NPC cats (spouse plus kittens eventually) choosing beds in the player's den? Is there a way to assign them specific sleeping quarters, or influence their behavior in any way?