You say this in your post at 9.54:
The people who are affected by this sort of sycophancy and denial of reality are plenty of real women and young girls who do spend their lives on the internet and are fed photos of a real life princess (and in our patriarchal world, becoming a princess by marrying your Prince Charming is still, depressingly, a life goal for many) who is demonstrably considerably underweight and yet praised for her figure and style. They look at these images and want to emulate them.
Please provide meaning to these words of yours:
They look at these images and want to emulate them.
You are not saying, "They listen to a load of women on Mumsnet or style editors of tabloid newspapers praising her." You are saying, "They are looking at images of Catherine. And want to emulate them" Why would they want to emulate her? She's had cancer. Do you think that these impressionable young women want to get cancer too? Or are you saying images of Catherine make them want to slim down - ie, that she is encouraging eating disorders in order to be as slim as her?
Why would that be? Because she's not being shat on from all angles in the media and being told that she looks horrible? Is that what you want? For her to be told, as a cancer recoverer, that she looks awful. Do you want her to not come out in public and not wear nice clothes and not work? Will you be defending her against the many critics who call her lazy and told her to get back to work, illness be damned, because other women have to work through cancer?
What exactly is it that you want from her, and by extension, other women with cancer? Do you want them to hide away? Never make an effort to look nice? Do you want them to never receive compliments on their appearance?