On previous threads like this I've defended the DoC, saying people are too quick to say she's "too thin", you wouldn't call people "too fat", etc. I'm a size 8, I run ultras, and I've had people calling me gaunt before. It's not pleasant.
But then I saw Kate in person for the first time last week, and I was a bit shocked. Either the camera adds pounds or she's lost a lot of weight recently, but she was the thinnest person I've ever seen in real life. And I spend my life surrounded by marathon runners. She's significantly thinner IRL than Eilish McColgan, for example, who a pp mentioned. I did wonder if she isn't well.