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I think it is connected because if you remember when she was walking down one of the hallways, she saw golden letters, they were the exact same as the ones she got and the girl in Paper lily was doing the bus ritual and they both are meant to be unescape-able  after you make it all the way in after doing the ritual correctly

I think we will understand more in the other chapter but, for exemple, at the end of chapter one, we see someone talk to the shadow girl and refering to her as " Kat " and, when you look more at her, you can recognize Kat's side ponytail! So I think we'll hear more about Kat in the future