Hannah Uzor was thrown under a bus for this one as editors must have known the turnaround time was impossible. As a mother of three young kids, 3 weeks is absolutely no time to work. She probably painted the entire thing over a weekend while the kids were away with granny. Tatler knew it would turn out awful but took delight at the fact RF can't retaliate due to the fact they picked a POC artist best known for her work regarding African diaspora.
All that may be true, but I also think it's a bit infantilising to suggest she had no agency at all. I'm freelance myself, and you have to learn not to accept contracts you don't have time for, and to say when it's not working out or you need more time. If she was unable to do that, that would be because of lack of experience, but she's responsible for it.
Also I'm guessing a commission like that would be reasonably well-paid? You have to use some of the money you earn for childcare, to do a professional job.
I do think it's possible that if they were deliberately trying to have a go at Kate, they could have reassured the artist "yay, it's totally great, we love it" when it's clearly not and she was swayed by that. But again as a creative you have to keep control of your work and if it's not up to standard that's on you.
Her more famous Sarah Bonetta painting is better and more finished - but it's based very directly on one photo.