Despite what she says about people discussing her looks, she knows what she is doing, I think it is about being zero size, she knows it will get people talking, and worrying. She became the nation's sweetheart with the sympathy vote.
The look doesn't suit her, she looks haggard and older than she is, but if it is her choice , and I would rather it was, then it's her business.
If she was ill, I don't think she would keep it quiet, if it's that miserable looking husband, making her too unhappy to eat, she needs to walk.