There is so much to know. She has to wonder, though, how much help the library is likely to be on this subject, considering -

"Don't people know?" she asks. "They must know. Especially - Sunnydale must have a much higher concentration than the rest of the country, that's why the death rate is so high. Don't people notice?"

Then she makes a face, because yes, she does in fact remember that she herself was talking about anemia not so long ago. And worrying about the iron content of Charlie's food.

She has already established for herself that she is an idiot, thank you, that's not important right this second.