Wow, thank you for the update. This may save someone's flock.
I had an old local farmer tell me "you always put the rooster in a separate coop" ... In Maybe this is what he meant
Yup, and if you make a big show of bringing a bowl of a treat (like wet feed commonly referred to as "pudding" or "mash") they will catch on pretty fast that there is a treat if you go inside before it gets dark. They should go in when the sky starts to darken, usually an hour before sunset in...
Someone once suggested to another poster having a similar issue that it might be an issue with mites or mice or something else having made a home in the coop and the hens not liking to share a bed with them. (Mice scurry at night and the chickens can hear them but not see them if there is no...
My hens LOVE styrofoam for pecking... So make sure they can't pick at it. Don't need a fancy wall, just something to mask it. Even a garbage bag wall taped up to make a surface will hide the lovely treat that is styrofoam.