So...just for reference, is anyone close enough to me who might have fertile eggs to give/trade me? I'd happily trade a dozen eating eggs for a dozen likely fertile eggs, if someone does indeed prove to be broody. If so, just comment here and I'll jot ya down for future reference!
I think the natural instinct is to NOT go broody in the fall. If you do figure one is broody, you'll want to seriously consider setting her up with her own nesting box and run that isolates her from your other birds. I would also have a suspected broody sit on fake eggs for a few days to be sure that she's really going to follow through with sitting on them for all 21 days.