I think it's bc she tryna cope with generally the fact that this world is fake. I don't think she wanna believe this world is real so believing it is like a stereotypical fantasy novel is comforting to her. Bc in the few parts of her thinking about her parents and then realizing the characters are not just characters but people and are complicated disturb her. She didn't wanna think too deeply about her parents or how she even got here, she cut herself off before it got depressing right? Then she got disturbed bc she realized the ML was confessing his love but had like bigger emotions she would want to see in a "character", making him feel real to her. I think it kinda makes sense.

Why is she so dead set on believing that it's romance Novel. She doesn't have any clue if it's a novel or a parallel universe or a different world or something. in what kind of romance fantasy world would there be so many murders and so many suicides and so many creepy things happening. And why would she draw that summoning spell without even knowing what it summons. and why couldn't she get a clue at the orphanage? The director had the same summoning spell drawn on the floor and she was trying to feed kids to whatever the creature that she summoned in exchange of a wish. That's a huge ass red flag right there , like girl take a hint. You have eyes and a brain. Also, why would she rip off a page of her mother cursing out her father and sent it along with a letter to her dad, like what was that supposed to achieve? It just makes you look so fucking creepy.