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.
"Alright...what happens if you thread your hair with strings of blue and green pearls?"
"Try threading blue and green ribbons through it?"
"Lace instead of ribbons?"
"Strings of crystals?"
"Strings of alternating diamonds and opals?"
"Okay, that's everything I can think of off the top of my head for hair...silver mascara?"
"Huh. Non-silver mascara with glitter?"
"Completely normal mascara?"