Malak makes it back to the cafeteria before dinner has actually started, which means she can complete a few errands before it's time to line up for food. She finds Maryam and swaps backpacks (Trading sedated mice for Aishah's clothes and mana crystals and prayer mat), informs Marcy of her room number ("565B, come find me if you decide to take me up on that thing I mentioned"), and gives Caio some alchemy tips ("The third station from the left in the back row of the freshman lab is badly behaved and sneaky about it, also turnip is a surprisingly good substitute for mandrake root if the latter is really hard to find, sorry but that's all I've got."). This resolves all her outstanding obligations apart from seeing Annisa at dinner.
She does, in fact, see Annisa before Annisa sees her. Technically, this fulfills her obligation on that front, but of course she's not actually trying to technically fulfill an obligation here, she's trying to continue to build goodwill and positive association with a fellow competent student. And demonstrate her own competence. And have fun. To that end -
Annisa is wandering around keeping an eye out for mals trying to sneak up on her and interesting people to eat with and talk to. This is notably different from interesting people trying to sneak up on her. A sufficiently large group of students one one side means she's buffered from mal attacks from that direction, but provides no protection from friendly acquaintances. Malak gets within arm's reach, taps Annisa on the shoulder, and says "Boo!" (She is ready with a shield in case Annisa overreacts, which she probably won't?)