What I did last time is I caught her and put her in an 8x8 that is a sort of annex of my main run. It has a little coop/nestbox that is an old cat house but she refused to go in it so I made a lean-to of old branches from around the property and she would sleep under that with the baby. She was going nutso being in there so whenever I would let the chickens out to free range I would let her out for a few hours and then catch her and make her go back in there at bedtime. Usually I would just catch the baby because she was so terrible about watching it and she would hear it crying and follow me to the pen. I am planning to do the same thing with this one when she comes back.
I do have one guinea hen that is laying in the chicken run which is great. Those are the ones I have been able to put under the chickens. The problem is that I have to keep the chickens confined to the run while I am at work because of the predators, and I have to keep the guineas out of the run so they don't harass the chickens. Otherwise I would be able to get all three guinea hens to lay in the run, I think. They are just too nasty toward the chickens, though. The one that is laying in the run got attacked by a fox Friday night (they have been sleeping in the trees lately) and it took a huge chunk out of the back of her neck. I don't know how she is still alive. I gave her a shot of antibiotics that night before I put her up in the coop. He definitely would have finished her off if I hadn't happened to be sleeping with the windows open and heard her screaming. I regret not grabbing a rifle as I ran out the door because the fox chased after her and got within 20 feet of me. I know it is going to come back again and I need to be ready. I am back to herding them all back into the run at night. It worries me though since now I know there is definitely a fox covering this territory again and I assume the girl on the eggs in the wood would be within his territory. This is a hard time of year out here because the fox predation jumps way up since they have babies to feed. With us being on a peninsula and having no natural predators or competition to keep the foxes in check, I don't feel bad killing the ones that attack my flock.
Anyway, when the one that lays in the run is locked out of the run during the day she just lays it right beside the run and I put it in her nest when I come home, if my dog doesn't find and steal it first.
I have been keeping her confined to the run the past few days, though, because of her trauma. Interestingly enough, she still laid the day after the attack, and a double yolker at that, and has been laying each day since. Her wound looks terrible but I can't get a really good look at it because she puts up such a fight I am worried about causing more damage. The best I can do is give her a quick stick with the needle and hope her body does the rest, as far as healing.
Believe me, I am worried about the girl out in the woods. But it is out of my hands so I am trying not to think about it, staying hopeful she will turn up in a few weeks but also trying to be realistic so I won't be sad if she doesn't.