I would be leery of putting too many eggs under her. Broodies naturally move eggs around, with a big pile sometimes the ones on the outside edges are not warm enough and they die, then she stirs the nest, moving the now dead eggs into the middle and the ones on the edge die. You can get very poor hatch rate. Just because you got all those eggs, doesn't mean you have to hatch them. Just saying.
Personally with a standard chicken, I found I got a much better hatch rate with 8 eggs set, than with 12 eggs set.
Mrs K
Personally with a standard chicken, I found I got a much better hatch rate with 8 eggs set, than with 12 eggs set.
Mrs K