Oh no, just seeing yolk isn't a good thing. Unless it broke after she laid it. I would call the vet and see what they say. Nothing new with my Myrtle, she goes in and out of the sandbox a few times a day, usually when I'm not around ( I make a pattern in the sand so I know when she's been there)and she's still eating, so I just wait. Let us know what the vet says about the yolk. Did you ever get an xray to see about how many she has?