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.
Kanimir and Jaromira in Fabulous
"Fortunately, I care even less for the opinions of sunfish than I do the opinions of other humans who are judging me."
fabulous_ones
"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."
fabulous_ones
"I have startled myself with the occasional weird opinion on cryptid appearances but I think I also prefer that you not be a sunfish."
fabulous_ones
"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."
"It seems peculiar that it leaves asexuals alone but flips heterosexuals instead of making them asexual."