It sounds like you’ve modified quite a few things since that first weird egg, all of which should make her even more likely to succeed.
I don’t have any personal experience with any W&Y animals, so I’m just listening to others that do have experience, like you.
That’s a really good point!
I made a post awhile back with some info, let me go look for it after I post this. I’ll edit this post to add it here.
EDIT:
If you mean for intact eggs, I’m not sure, but I suspect it might be simpler to check for eggs directly/externally. The thing to remember is that there will always be light spots that are fat pads (in a healthy gecko), and that eggs are more caudally located (towards tail). If you mean a collapsed egg, I don’t think it’s likely something you’d be able to visualize externally or using a flashlight.
I think those are likely fatty/mineral deposits. If you radiograph some geckos with those fat ‘armpits,’ they have radiopaque granules. It’s my understanding these form in response to high levels of supplementation and/or obesity. I am trying to observe my own guys to see how/if it varies based on supplementation schedule, but I don’t want to experiment on my guys drastically.
You could try slightly lowering the amount of multivitamin & calcium you give, and see if those axillary areas reduce in size. I don’t worry about the phenomenon much in my guys so long as it isn’t prominent. I mostly see it in my males, so I know to back off on supplementation for an individual boy just a bit. I assume it’s because females have a higher need for calcium when reproductively active, so end up with less surplus to store when on the same supplementation schedule as a male.