She is sitting in the library, studying. It's her most common pastime, by hours; spending time with her sister is more enjoyable but Jaromira prefers to socialize more broadly and Katarzyna would only get in the way. This is better on net; the two of them share a room, so it isn't as though her sister's time is entirely hogged by the other girls who call this boarding school "home." Or at least "prison." Katarzyna doesn't mind it, though; the school library is excellent, and basic manners and care for the books has endeared her to the librarian to a sufficient degree to lubricate the interlibrary loans process when there's something she wants to read that they don't have.
"I don't know...maybe it's because penguins make sense, and sunfish are just objectively ridiculous."
"Their primary food is jellyfish. Do you know how many calories and nutrients there aren't in a jellyfish?"
"I can't say I've ever tried to subsist on one, but it seems to be working okay for sunfish."
"This is true, but it is bizarre that it's true. Well, evolution will fill every niche available, I suppose."
"Fortunately, I care even less for the opinions of sunfish than I do the opinions of other humans who are judging me."
"But maybe sunfish are the only holders of secret aesthetic wisdom. Maybe with a sunfish theme we could be omnipotent!"
"Hmm. I suppose if the human form is objectively incorrect, that would explain why things like wings and tails generally win one points."
"I have startled myself with the occasional weird opinion on cryptid appearances but I think I also prefer that you not be a sunfish."
"The day after I put on wings I saw a picture of her on a magazine and couldn't stop staring at her and it was so strange."