Thanks folks for your support. It doesn't seem real, but it is. We're figuring it was likely racoons, as they are kind of known for killing and not eating. Senseless. I think I would accept it better if it was a hungry animal that at least got a good meal, but this was just sport, which breaks my heart. They died for nothing.
Upon further inspection, whatever it was was extremely determined to get at the chickens. Tried to dig under the run almost the whole way around it, tried to dig under the coop, tried to rip the mesh off the top of the run, and finally figured out how to push open the nest box cover. If not for the heavy storm, the noise (and motion detector light) would have alerted us, or at least the dogs, and we might have had a chance to save them. Rifle is at the ready.
Little Waffle spent the day in a large dog crate to be safe and comfortable. Still filthy and caked with dirt and mud, she settled down enough that she still gifted me with an egg when I got home from work! I took her out to roam for a while before dark, and she was happy foraging in the garden.
I secured the nest box with hooks, latches, and whatever else I could find, and a friend "loaned" us one of her hens for a while, so Waffle won't be all alone. They seem okay together. I'm thinking of calling her Renita. (The RENTal chicken, lol) Rough day of change for both of them, so they're currently still roosting in the coop. Yeah, I had to go out and check to make sure they were in there and okay.

All good, and as I'm writing, they just came out for some fresh feed and water. Yay! Egg check later this morning.
#TeamWaffle!