Whatever Jo might have been expecting from Fred's companion, it... wasn't this. She was still trying to wrap her mind around the fact that he'd brought a gift to a vampire wedding reception. But the old-fashioned manner of speech was certainly different as well. She wasn't overt, but she did glance at Fred to see what Fred made of the request for the two of them to sign.
Then again, she just wanted to check out the vampire whom she was currently being forced to work with and... well, she didn't know what she planned to do next. Make sure there wasn't any trouble, perhaps?