I'm not as certain she knows exactly as much as Ryll suggests, but I'm of the opinion she knows far too much. She's trying with her full willpower to pretend not to know. It's far easier to keep pretending if you convince yourself you don't know. It ought to be a way of life for her already. Kind of like the regular people in organised crime neighbourhoods never see anything when asked by the police. They may not be afraid of the police, but they are afraid of the mob even suspecting they said a single word too much to the police or behaved strangely in the presence of the coppers.