
 Hey all. I always like to check on my flock in their coop at night, and last night was no different. However, I noticed that one of my Golden-laced Wyandottes was missing. This has never happened before. I found lots of feathers about 15-20 feet from the coop, but that's it. We live in a rural area in NW Georgia, and have about 10 acres of land. The chickens have lots of areas to 'hide' in, including structures in our yard as well as lots of shrubbery. This attack would have happened in broad daylight, and must have happened when I wasn't home because I didn't hear anything (I WFH but went to get the kids from school). In case it helps, the area of attack was under a couple of tall trees, near a carport, but it wasn't by the edge of the woods or anything.
I'd be lying if I said I didn't cry about this or have various nightmares about chickens last night. But, I'm trying to be strong and figure out the best way forward.
Right now, I have everyone locked up in the run. 
How long should I do this for? How can I determine what the predator was? I raised that chicken since it was just a few days old, and we've always free-ranged them without any problems, for over a year. I realize that's probably just luck, though.
In addition to 4 adult hens, I have 11 young hens and roosters (about 3 months old). I hatched a bunch of eggs back in May, but I'm still trying to figure out which is a hen and which is a Roo (unfortunately, it seems about 8/11 are Roos). I won't be keeping them all, but for now, they are my responsibility. I'm worried about keeping everyone locked up together - the run isn't huge and I feel bad keeping them confined like this. I also know it's important to keep them safe, though.
Any advice?
Thanks.