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It is so difficult to get a proper picture, she's so squirmy! I am not sure how the vet will manage, but I've been assured she's experienced with hamsters (she was very good when my last passed of wet tail) so I'm sure she'll be able to get a good look.
I will try again tonight. I have just got in, and haven't seen her today but her food is stashed and her home has been remodelled to her liking since the cleanout (meaning she has piled up all the substrate at one end to burrow in) so she has likely been very active overnight. I am not too worried about her just yet. I am glad your hamster healed up, I am hoping Luna being otherwise healthy will help her recover from whatever this is.