P.M.
If you're making sweets a heavy "no-no" for her, my guess, based on my own life history, is that she's craving sweets more and enjoying them less. What finally worked for me was to give myself complete, joyful permission to enjoy sweets, and making even one piece of chocolate, one slice of pie, a celebration. I learned to give my complete attention to every bite, every lick, every swallow. By the time I finished 1/4 of a chocolate bar, I knew I had eaten chocolate, by golly!
Then I would attend to something else I liked to do. I also gradually learned that the "necessaries" of life, like housework, can be a source of amazing satisfaction when done attentively and with love.
I did not learn this as a child. Work was sheer, joyless drudgery for my mother. She complained about it constantly, and laid as much housework and odd jobs as she could on me and my younger sisters. I grew up believing work was for hating. And food was for self-denial. What a waste of life, and loss of potential happiness.
But I met an extraordinary young man who knew the joy of service when I was in my 20's, and his example was a revelation. A group of friends was meeting at his house, and when we arrived, he was finishing up dinner dishes. And he was simply radiant with love. I have been a much happier, and less needy, person since seeing how transformative it is to give total attention to my daily activities. Including eating!
I know this stuff can't really be taught, but I hope you can capture something in here that gives you a new handle on how to help your daughter.