Hello, my mallard hen layed a nest of 13 eggs in the backyard. It is now December 3rd. Will she be able to hatch them? Will it be too cold, I live in Oregon. Will she not be able to keep them warm? And also, if I want her to sit on them I need to keep her out of her pen all night and day. Is this to dangerous? What should I do. Should I let her try and sit on them?