well, what does she absolutely NOT want? ie shoes, colour dress etc? Id be going with that! "Oh my dear, you dont like the 80's puffy style watermelon tizzy dress the girls are having? Oh, well dems da breaks!"

N maybe she will quit of her own accord?

LOl, sorry, not much help, im just feeling terribly vindictive myself ATM. Best of luck to ou hun, i am learning that in most cases in laws just... well..... suck