Good to know. As there is a lot of room, they tend to lay where there is no poop (and have started to use the nesting boxes). I'm currently not worried about "poopy eggs", but you make a very good point.
i have a nest box that is uncovered and beside a favorite roosting spot. It’s also, coincidentally, the best nest in town. I love my blue Americana eggs, but since they’re the lightest they stain the easiest. Not really a problem for me, but when I give away eggs I always explain that they’re washed, just stained.
Awe poor girl, my mom once pressure cooked a bunch of eggs. We opened the pot and it smelt awful, and going through the eggs we found some almost fully developed chicks.One of the eggs which she collected and used for breakfast turned out to be partially developed, and she just freaked out (as you can imagine).
If the rooster is nice, I would totally sit down with her and explain how these things work— the rooster fertilizes the eggs, but the hens will sit on the eggs to develop the chicks. Who knows, later on you guys might want some chicks after all.

Still must be traumatizing to crack and egg and have something more than white and yolk pop out!