was your fence on when you found this? And did it have a good charge on it? Just thinking something could have reached through and swiped at the hen if the fence was off or ?aoxa, I don't mean to detract from your situation - and before I start writing, wanted to say how sorry I am for your loss.
Before I read your post, I was outside taking photos of what I came home to today. Thankfully my story hasn't turned out like yours - at least yet.
When I got home I went out to gather eggs - around noon today. As I was walking out there I see this:
You can see these are under the edge of the electric netting. I did kind-of pull some of the feathers toward the camera but when I first came out they were more concentrated right under the net.
So I'm thinking - great...something tried to reach under ...or a hawk...and I was imagining having to go hunting for a body. However when I went inside, they were all there but one of the BRs was in the nest. I waited for them both to get out of the nests and have been observing them but don't see anything obvious. If there weren't feathers on the ground I probably wouldn't have noticed anything - they are both behaving like normal. It looks possible that some tail feathers are missing from one of them.
Now, after having come in and read aoxa's post and the comments that folks have made about not seeing any blood or anything obvious, I'm thinking I should probably remove them from the roost tonight and see if I can get down to skin level and look for any signs of broken skin, etc. I guess it could be possible that she got too close to the netting - maybe sticking her head through?? And possibly got tangled up and thrashing around trying to get loose?
Not sure - anyone have any thoughts?