My narc stays mad for a long time. Usually it is just time that helps them get over it, or you can feed the ego of the narc but showering with praise and telling how wonderful they are, they love that! It is like a big monster is inside of them that needs LOTS of praise and attention and that will help them to focus on how they are perfect. Oh, and you can tell her how stupid and idiotic YOU are and how you wish you could be more like her. If these things don't work, nothing will. If this is truly a narc, my advice is RUN!
"Two loves have made two different cities: self-love hath made a terrestrial city, which rises in contempt of God; and Divine Love hath made a celestial one, which rises in contempt of self. The former glories in itself-the latter in God.”
-Saint Augustine, Father and Doctor of the Church