Hard to know what's going on with her unless you have testing.
They were sick right after you got them right? Some birds can become symptomatic repeatedly over their lifetime while the other may not, but they are all still considered carriers depending on the disease.
So you have a rooster too then?
Unless the broody is unwell (symptomatic) and needs supportive care from you, then I would leave her alone and let her hatch the eggs. Even if you took the eggs and successfully hatched them under a heat lamp whatever your flock has, they will be exposed to the...
You've had them for a year but still see swelling around the eyes? Maybe I'm reading your post wrong.
Where did the eggs your broody is sitting on come from?