For someone who has been bereaved of so much -her parents' marriage, her sister, her mother, her first husband, her privacy and safety in her second marriage - no wonder she has had a fuckload of the very best work done. I would doubt a gastric band personally but one of those diets where they drop the food off to you so you don't have any at home, or ironically a personal chef, quite likely imo.
I don't want anyone to be unhappy but I can't help hoping that she really is happy. Her piece about grief in Feast is a beautiful piece of writing.