His presence here, in and of itself, is a pleasant surprise but not really very surprising, in the truest sense. She wasn't expecting him to be here, but she wasn't very startled by it, either. His chosen method of communication, on the other hand (so to speak)-- it's funny (except it isn't) that she hesitates to assume he learned for her. That's her first thought (delighted, touched, important enough to accommodate), but it's promptly undercut by her second and her third (there are other possible explanations, she isn't the only deaf person in the city; she shouldn't be presumptuous).

It's funny, except that it isn't, what she will and will not presume.

She reminds herself that she's pleased (because she is), before she can forget.

Hi. And then he gets to wear her hat. As a reward.