If she has straightish dark blonde/light brown hair and her last name begins with a D, then I may well know her and we may be... slightly less than buddies, let us say.
If not... there are probably tons and tons of Christines all over both Fair(e)s, and we're probably just a degree or so of separation from each other and might kind of vaguely recognize each other's faces without actually knowing each other. And maybe she seems familiar to you because you came to the Ren Faire that one time and saw her someplace in the crowd?
eta: I don't know about other Fluevog stores, but the one in SF is having a contest right now where all you have to do is go in and try on a pair and you're entered in a contest to win free shoes for a decade. Lee may need to plan a trip up to SF for this.