Hopefully she is hiding and will show up. If you have a game camera, put it up. Some predators snatch and grab and leave no signs. If anything is lurking you may see it on a camera. I have several. I was surprised at the predators that roam here especially at night but have lost birds in the past during the day. Good luck...
She's a wyandotte and she's never gone broody before, but she's also only been laying eggs for about 4/5 months. The only one of my hens that's ever been broody before is my silkie, but I suppose she could be. I just don't know where she could or would be hiding if that was the case.
When you get her back start training all your birds to come on command. You'll probably have to use treats just as you would a dog. And make sure they learn to sleep on a roost inside a predator proof coop at night. Every night. Same roost spot. Chickens can be trained quite easily. Good luck Hope she come home.
