"It's entirely possible there is something at work which legitimately has to go, on which her existence is ontologically dependent," says Bella, ticking off fingers, "if your hypothesis is right she might be sustainable in principle but have something nasty after her which I will have to fend off, either me or literally everybody who has ever had the slightest counterfactual causal contact with the possibility of her existence has been mind controlled, and even if this is otherwise some completely benign gosh-leprechauns-are-real-and-they-give-you-sisters thing and nobody is going to die or be further mindwhammied, at some point I am probably going to have to explain to her that from the perspective of inside my head she's brand new and I don't think she'll take that well!"