Due date dubious

A few days ago the white broody got really deep into it, no longer leaving the coop in the morning, and assuming a very deep meditative state.  I gave her a bento box and water, and she snacks on it, but at this stage she must must get very serious about her mission.The cardboard has worked - no more egg thieving.  Her due date has come and gone, and I expect the worst, that she's lost them all for being too ambitious.  Yet, I hope for some hatching.I'm waiting for her head to come up, I remember it from last year.  When she starts looking awake, it will be because there's something going on beneath her.