If you go to touch her does she growl and fluff up? If so she is broody, I would try to isolate her if you can. Some hens may lay new eggs next to the ones she is already sitting on. If this happens, she might gather too many eggs for her to effectively hatch (some of them will get too cold because they get pushed out to the sides) and when/if they do hatch, she will leave the nest within a day or two leaving any half incubated eggs to die. Isolating her can be simple. If you have a large nest box (about 1'x2'), you may only have to close the entrance and put food and water in with her. If the nest box is high, and small, you may want to move her to different broody quarters after dark. My setup for broody hens is a 5'x 5' PVC run with chicken wire on the side and a tarp covered lid and a large tote with a door put in it. To put in a door, cut a hole in the short end of the tote (make sure the tote is flat on that side or it won't work as well). Make two wooden frames that have and interior dimension that is slightly smaller than the cut opening. Sandwich the tote wall between the two frames and screw the frames together. Make a door with a hinge and a latch put tread bars on the inside of the door. Drill some air holes in the side and you are good to go. This setup works well for broody hens and mamas with babies as well. I put this setup inside my electric poultry paddock so the hen stays with her flock and the babies are introduced into the hierarchy.
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