Four out of my 5 original hens are broodies. Before I knew that, I ordered a couple of Buff Orp chicks. They now want to be broody. Not real serious yet, but I know they will be next spring. Also, I hatched the eggs from one of my broodies, and the one nonbroody. Both are Dominiques. I...
Sounds broody to me, too. I have one about the same age, also a buff orp, who is trying to be broody too. So it can definitely happen.
You may want to try and break her of it. Some broodies are more determined than others. It has taken me up to 2 weeks before. And what a pain!
Some things...