Polaris was obviously there early and helped her mom set up whatever she needed before going back to her room and getting ready herself because... reasons, okay?
Also because she has no shame in herself she sang along to Aladdin and the Lion King in a few places. Because we all know we do it, don't lie to yourselves.
Since some of her school friends were there, she made her way around quietly hanging out and chatting and being generally friendly. She might have wandered off by herself once or twice to go outside and walk Simon in the yard and get air because that's just how she is.
It was a fantastic night. She says there should be more, and thanks her mum and helps her clean up afterwards and things.