Beth, the news is not so great. Went out a few minutes ago. Eggs were still slightly warm, but Nugget was on the roost, hunkered down next to Snow and very obviously half asleep. So, since it will be in the teens, no need to leave the eggs out there to freeze. Took them inside and opened them up. Probably just as well that she isn't sitting since not one of Dusty's three were fertile (though I did open one after collecting these that did seem fertile, so maybe next time...). All others had started to develop, including Smoky's, but were just at the "cloudy skies" stage on the yolk.
ETA: On the bright side, Shadow laid her 3rd post-prolapse egg, no blood streaks. We checked her and her vent is no longer pulsing like it was for a few days after we pushed the prolapse back in. Yea! She seems fine now.