The other students don't openly gossip about Maya, and especially not her brother, under the very real fear that she will find out and beat them up lmao With her asking about the student council, they ask if maybe she's interested in joining? The student council as a whole plans and organizes things for the school like the charity auction, sports festival, cultural festival, etc etc, essentially making all these things happen with hands off faculty supervision. The president is at the head of all of this, and is the one who makes executive decisions, delegates tasks to the rest of the members, makes sure everything is completed properly and on time, and is essentially the one who catherds and assumes responsibility for the student council and student body as a whole.

Inside the library there is no sound, so other students aren't heard talking; in the confusion, some students may have had their mouths open or were making as if they were shouting, but out of habit rather than communication. Maya was directing students outside of the library, so she did talk, but mostly things like "Hey" and "Stop" etc and glaring at the students crowding the library.