Also, besides the 20 or so copies of this specific pose I see on the first page, I also see numerous others of her either in a different pose or in a different (but similar) outfit -- she's apparently fond of that color combination.

I just put my local copy of Stable Diffusion to work cranking out images based on an "Anne Graham Lotz" prompt. So far, none of them look anything like the original image. It has generated one of her wearing a similar-colored shirt, but the pose is completely different, and as noted above, she seems to like that color.

My mistake! I mis-remembered the original Google paper[0], which stated only that the image was in the Stable Diffusion training set.

The complete set of "matches" they got were interesting, even while the number was very low.

0. https://arxiv.org/abs/2301.13188