Birds (chickens, guineas, etc.) that are free-ranging tend to lay their eggs in the same spot. If she was a free-ranging hen, she would have been laying her eggs for some time before she got broody and started sitting on them. My three remaining hens are only out for half a day, and I found a clutch of five eggs over in the tree line the other day; I think only one of them is laying at this point, so she was laying in the nest box if she was in the coop and in the nest in the tree line if she was out.