BB, that's a very good general form. I hope you don't mind if I snag it for future use! I wish I had as elegantly phrased my rebuttal to a buyer that wanted to return a pair of shoes for 'being narrow', even though my auctions note that I do not (usually) accept returns on fit.
I was trying to be polite, but I didn't know quite how to present that I wouldn't refund her for shipping in either direction if she elected to send them back.
Anyway, OP, this seems silly, but if she's amenable to paying shipping both ways, then I would personally accept the return to prevent an unhappy buyer, especially if it'll be easy enough to resell it quickly.
I do dislike buyers that leave negatives or neutrals based on color, personally, because it seems somewhat unreasonable for online second-hand purchases, unless wildly inaccurate (like black pants looking green or blue). Most people's monitors aren't properly calibrated and camera settings sometimes don't use web safe color spaces, or the white balance is not correct.