"Obviously I'm going to the library about it." Probably later today, but she's not going to tell him that-- partly because the eagerness feels unseemly, mostly because she's well aware that she lied about being picked up and doesn't want to acknowledge that isn't true.

"And now you're back here," she adds, musing. Not quite asking the question about why-- what he's so interested in now, when presumably he's not hot on the trail-- but leaving space if he wants to tell her.