Kyouka’s good at memorising information quickly. It’s a natural skill that she’s refined; if it’s something she needs to know, she only has to see/hear it once before she has it locked in.
As for nonessential information, well, her memory for it isn’t perfect, though not terrible either–just slightly better than average, perhaps.
When she gets new plush rabbits, she sometimes models them after Agency members by getting them similar clothes or accessories. Generally, if she’s planning to do this, she’ll ask said Agency member to help come up with a name for the rabbit.
She has tea parties with her rabbits. Demon Snow isn’t allowed to attend them.