To me she sounds like a "perfectionist". You can never please that kind. Wear your kilt tastefully, remain polite and courteous, continue providing the best job you can. You've tried to talk it over and she's rebuffed it and you can prove it. If it comes down to her complaining there is evidence she's the disruptive element. Personally, I doubt she'll make any issue of it besides minor little remarks to you now.