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.
"Mmmrrrgh I have to start flying back if I don't want them to decide to officially notice I'm off school grounds without permission."
She takes out her notepad, writes her number on a clean page, tears it out, and hands it to Isabella.
Katarzyna flies back to school, cursing their stupid curfew enforcement policies in her head for a few minutes before the joy of flight and of the preceeding few hours comes back in a rush.
She lands and goes inside, earthbound now but still floating, getting a few odd looks from those who know enough about her to realize that it's odd for her to be so thoroughly blissed-out, and wends her way back to her room and flings herself onto her bed to scream her delight into a pillow.
"I met Isabella! Isabella asked me out! We went on a date! We kissed! We had stimulating conversation! We did magic testing! Isabella is the beeeeeest~"
"I love you too."
Okay, where's her laptop, there's her laptop, time to do research on Coast Paladin teams and powers thereof.