BruceHmmm, I don't think I have ever had an egg broken in the nest but if it was a soft, basically no, shell, I can see it happening easily enough. I've had my share of "membrane only" eggs. Just lucky I found them before another girl went in the nest I guess. Plus, I sometimes find them under the roost in the morning. How a shell-less egg can drop ~4 feet (into shavings) and not splatter is anyone's guess. I am a bit nervous about eating an egg with no protective shell though so I cook them up for the girls.
Hopefully your Silkie was just taking advantage of the "easy open" egg and isn't going to be one that breaks them on purpose!
Bruce
My oldest Silkie is the only one that's ever layed soft-shell and usually after a long productive cycle - she winds down and spits out either a mis-shapened or shell-less egg - we have to keep on top of it because we never know when that will happen again. Her beak is too small to break hard shell eggs but it's the soft shells we have to monitor. Once our klutzy spooky kooky Ameraucana broke one of her hard eggs in the nest with her big feet and that was a mess to clean up - the ants were on it almost immediately.
Syl