[ Her eyes flicker up quickly when she's addressed and, for a moment, her mouth drops open. Hermione wasn't exactly expecting anyone to go out of their way to help her or even talk to her, really (she's far too used to people ignoring the panicked girl in the back of the library) but, after a moment, she forces a bright smile. ]

Oh, no, I'm fine... I think. I'm just trying to learn as much as I can about this place before I go and, um. Join in?