I've had my hens stop laying twice when others have gotten killed. The first killing they all saw in their own coop from a coon, my bad, forgot to close the door, inadequate fencing..they all stopped laying but her best friend never laid a normal egg again. Tragicly she was then killed about a month ago along with another one, on a free range day. Someone else's dog came into my yard and almost killed 4 but two got a way, two did not. They quit laying for about a week. They wouldnt even go outside in their fenced pen for 2 days. Now they are back to normal and want outside to free range again. Just give them time, depends on how close they were how long it will take.