It's possible the heat did her in and the crow came to eat.
Set up a camera. You live in the desert. It could be a coyote, a fox, or something else. I don't think crows will eat chooks.
Odd observation, but:
I used to live in SoCal. I did a double-take when looking at the bottom photo. That tile looks like the tile I remember having, and so do the cabinets.
My alpha never goes for it first. She lets the others eat. I think it has to do with her belief I am a rooster. Not to mention recent bullying from Dominica.
I think my In Albis has her natural tendencies in her. She went broody this year. Agathae convinced her.
My Dominiques are food monsters. They know the sounds of the fridge in the back room opening, the scraping of a spoon on a bowl of yogurt, the sound of a plate being set down, and the look...