Broody? or something worse?

[danalw]

Hello everyone, I am seeking some advice.
So I have a hen that has been sitting in her den box on all the other ladies eggs. She is loosing weight she has not laid an egg in over a month. If i lift her out of the box she will go scratch around and eat and drink for a bit but she gets right back in after a few moments.
I thought she was egg bound but she is not bloated, lethargic or showing any other symptoms.
I have tried everything I know/ everything that has worked to stop other ladies from brooding perviously but I just cant get her to stop. I have upped her calcium.
Any suggestions? Should I stick my finger up there? Isolate her? Get a fertilized egg from a friend? I really don't know what o do for her but I'm worried.

**UPDATE**
So I get everything set to give this chicken some babies including buying the chicks and she decides she's not broody anymore. I didnt even have the chance to try to get them under her. The day I brought the day olds home she spent all day out and about and one of the eggs she had been sitting on had been eaten. She has been happy and out since. I don't know when I should expect her to start laying again. I have never had a hen go broody that long before. On the plus side I got some cute little easter eggers. (He called them ameraucana but they were cheap soooo....) I call them Janis Joplin and Stevie Chicks