later in the raw, it is revealed that she IS crazy and everything is part of her delusion. Turns out she overworked, ruining her health and became crazy.
Nyaako was the cat her grandmother kept.
Spirit loli was from a story her grandmother told her as a child and was modelled after her former classmate.
I'm just joking. She probably does appear crazy or over-stressed to others
I hope you're just joking. It would be too depressing otherwise...
Actually...
That was the exact plot of the Ghibli movie When Marnie Was There, she listened to her grandmother's tales as a child before traumatically losing her, and the movie tells the tale of her as an adolescent hallucinating parts from those tales while on vacation where her grandmother had once lived...