Hermione is usually much more reasonable than this, at least. At this point, it's the illness more than the principle of the thing that's making her so bloody stubborn.

"I thought-... aren't spirits... bad?" It doesn't make sense to her; she knows ghosts, and Nearly-Headless Nick is about as harmless as they come. But nothing she knows from back home is exactly the same as Thedas. "People are afraid of them. But then, they're also afraid of mages. It's silly to be afraid just because you don't understand something, I suppose."