Catalina loved Christmas, probably because she came from a big family where Christmas was always a whole lot of fun and filled with love. It also gave her a reason to spoil those she loved without their objection and/or need for justification. So she saw Christmas as less of a... Time to party and more of a time to be with those you loved and to show them you loved them.
When Catalina was younger her Mother had taught her how to make egg nog and hot chocolate with a special recipe that kind of stuck in their family and always ended up being to die for. So it wasn't actually unusual for Catalina to always have a batch ready for people or to take it when she went visiting. Like tonight! She was visiting her Sister to share in fun Christmas-y sisterly cheer! Lina hadn't worn her pajamas over because she had to make the run back to her room later that night or tomorrow morning so instead she'd opted for some comfy lounging clothes instead.
Catalina was near the sink sipping on her hot chocolate as Nacola bounced around the dorm singing. She had a silly smile on her face as she watched on with absolute amusement. Lina was dancing a little on the spot as she watched the oven as the cookies begun to rise. Catalina begun to sing the next line but burst into laughter instead, "You have batter on your nose!"