Hey
TWolfBC I am definitely not ruling out an issue with her health, but, so far, she sounds broody to me and the pecking at your hand when you try to take her
egg [golf ball] or go near her nest has just increased my suspicions.
Yep, as mentioned, by broodies will sit on an empty nest and I have heard of some broodies sitting on a rock in the hopes it will hatch
You have two options here, give her some fertile eggs and let her be a mumma or break her from her broodiness.
Some chickens will give up on being broody on their own but this could take weeks and her condition could deteriorate because she only takes a break once or twice a day for something to eat or drink. Some broodies have been known to not give up and literally starve to death.
Also, the sooner you break her from her broodiness, the sooner she will go back to laying.
If you research breaking a broody, there are a few methods but I find the crate method works the best for me.
Basically, the broody is in a crate, raised slightly off the ground to allow air flow and cool those hormones down and cut off all chance of getting to or making a nest.
In the crate she has food, water and a roost, but nowhere to get comfortable as such. Some people leave their broody in the crate 24/7 but I usually just leave mine in there during the day then pop her on the roost with her flock mates overnight; ensuring I am up early and put her back in the crate before she can get to a nest in the morning.
Depending on the determination of the broody, she may need to be in the crate for anywhere from 2 to 4 or 5 days.