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 only got magic yesterday, so if Jaromira's ambitions have shifted in that direction it hasn't come up yet. Previously she was undecided."
"Jaromira is more likely to do something involving larger numbers of people at a time, I think. She is the most outrageous extrovert."
"I prefer to not be around people I find disinteresting. Thus far, I do not find you disinteresting."
"Magical girls have a much higher assumed baseline interestingness but you have in fact been distinguishing yourself upwards."
"From what I can determine, what magic one obtains is almost certainly completely uncorrelated with the sort of person one is."
"Sure, but if you're interested in studying magic you could still reasonably be particularly interested in people whose magic interacted with yours."
"I distinguish between being interested in the magic and the person. Tolerating someone to study their magic is different from enjoying their company."
"I enjoy some people's company on net in a way I'd be reluctant to round down to tolerating them for instrumental reasons even when I can identify factors which, if removed, would take with them my interest in the person's company."
"Enjoying someone's company and tolerating it because I want something from them feel very different to me. I suppose it's possible magic will be different."