This actually happened to me many years ago as well. I wasn't interested, though now after so much time, I'm rather sorry I didn't take the opportunity to experiment at least to make quite sure I had made the right choice (I always suspected life might be a hell of a lot easier if I had stayed within my own gender, but alas, I am addicted to men in beards).

But I did talk with the girl who made the overture to ask if I were correct about her intentions. I was correct, and I saw the disappointment in her eyes that it wouldn't go anywhere.

Best to approach someone with the same kind of sensitivity you would like to have expressed to you if the situation had been reversed and you had made the first move, yes? If she lights up, then you're on the same page, and good luck to you both!..xx..e