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
"My outfit hasn't passed muster with anyone more advanced than my sister but I'm going to a stylist on Sunday."
"I have a power that lets me mimic the powers of other magical girls who are nearby. It doesn't affect them at all, but I try to be maximally scrupulous about consent--can I try yours?"
"Thanks!"
Okay, time to go somewhere reasonably discreet. She locates the speed magical girl, and copies her first--what are the limitations of this power?
She assumes not from what the speed magical girl was saying but does it do anything for her reaction time?