I had a hen that was broody this summer and I brought her in and let her raise the babies in the trough I use in my carport room for juvies. When I went to put her back she was rejected by the flock. The same flock she has been in for 2 years. I had added a few juvies to the pen and it may be because the "top hen" thought there was enough in that pen. IDK but I put her in with my porcelain roo and she was accepted as if she belonged there all along. I also had a splash hen that was broody it seemed most of the summer. So I ended up giving her some eggs from the sizzle pen and let her raise the chicks for about a month and she hasn't been broody since. Maybe your hen is just wanting babies real bad. It's not easy to break a broody hen once she has made up her mind. And I always put a little feed next to or in front of broodies that are doing it alone. It's rare around here. It seems once one starts the others follow suit