I wish I had an answer for you. I thought you were describing my wife. She hasn't had any interest in 3 years. wierd.
I did try to discuss it and that created a very lenghtly lecture of her importance in life. So now I don't bring it up anymore,just trying to learn to abstain.
I don't understand all this stuff, because I do the housework, dishes and cooking, so why not the lovemaking.