Skinny broody girl. Should I worry? What to do?

Ok, so my Americana is stillllllllllllll broody. I've been letting her do her thing since the new year (as I taked about in my past post). I boot her off the nest two times a day. She usually isn't sitting on anything, but still gets all fluffed and sings at me. She comes running out on her own for treats in the am with the others, but goes right back on the nest. I didn't want to cage her but she is getting lighter when I pick her up. I can feel her breast bone and there isn't much meat on either side. At what point do I worry. Should I supplement her? Do they starve themselves over this?

 

Well, I'm new to this. I got suggestions to seperate her and put her in a wire bottom cage to break it. Others said she will come to her senses eventually. I'm not set up to easily seperate her and I didn't mind she stopped laying. I have eight other layers all are under a year old. I'm not interested in chicks, just eggs. Any suggestions?

 

Ok, so tell me again how does the cage work? Should the cage be in the coop with the others? For how long? It's still gets down to freezing in this area at night, will she get too cold with out bedding? Should I give her a board to perch on?

 

Sorry, just saw that last post. 4-5 days, ok. Is hanging on the wall for a reason other than air underneath. What about the chilly nights?

 

Half of my coop is their space, the other half is storage / access to the nest boxes which are waist high. I isolated an injured hen in that area in the past. Do you think I can put her in there with no bedding and have the same effect as the wire cage? She can roost on a 4-5" area which is about half the top of the net boxes. Chicken wire comes down the middle and there's a full man/ chicken wire door so she can see the others. Will it work if she's still sitting in wood ?