Hi thanks for reply. We have no fertilized eggs, she just thinks they are I guess. Yesterday she sat there all day and had no eggs under her. Guess I'll lift her up and put her out in the yard again. Hopefully break her habit. We only want eggs, not chickis. I was so sure something was wrong with her, never experienced broodies before. Young hens, they just starting laying two months ago.
You may have just ended up with a broody prone bird, they do happen, and it can be hard on egg production when/if that is your focus. You didn't mention if she is still laying any eggs herself? If not then I would definitely lean more toward the broody diagnosis, sleeping in the nest overnight is another strong sign. Removing her from the nest and distracting her frequently is often the only recourse unless you want to place her in an elevated cage to keep her undercarriage cool for a couple of days and break the broody cycle up.
You can do a search for 'how to break a broody' to get more ideas if you don't want her to hatch out eggs, and breaking her cycle would probably be the better idea rather than letting her brood nothing for an extended period of time anyway.