Librarians are hideous creatures of unimaginable power. And even if you could imagine their power, it would be illegal. It is absolutely illegal to even try to picture what such a being would be like.
Sleep is confusing. Dreams are baffling. The concept of transitioning from one perceived reality to another is a tolerated madness.
Clocks and calendars don't work in Night Vale. Time itself doesn't work.
You believe in mountains, right? Not everyone does.
Maybe she had come into existence seconds ago and had made up every moment until this moment to explain how she came to be sitting in this booth in this diner.