Honestly kinda cute ngl

https://youtu.be/abZtsmMUbJo?si=bMcfgUfoniXOdkoK

It's definitely something that happens in the episode and not just something from between episodes because in this clip she has her usual eyes

Wait a minute I think I know why she has pupils now

There was a glitch with her face in episode 3 where she had pupils for a split second, and people really liked it even though it was unintentional

So glitch might've added this because of that

Can't really be sure about the lore reason though

It could have something to do with her notepad though... Maybe she drew herself a new face