Lisa had been just about to ask Matt more about himself, like what he did for a living, whether he was traveling alone, etc. But that last question had sounded to Lisa like it might be a dismissal. Anyway, if she started asking Matt those questions, he would likely reciprocate and ask her the same kind of questions, and then she'd be forced to tell him a bunch of lies. "Yeah, I think I'm feeling a little better, thanks." That was mostly a lie; she was feeling terribly alone and frightened at the moment.
She took another sip of the water, then said "I guess I should be going. I hope I haven't been bothering you too much. And I really do appreciate your helping Chelsea and Molly."