O.K.
Officially confused again.
Just checked the broody again for possible chicks. Only 3 eggs in the nest now; 4 a couple days ago. Half of an empty shell near the nest..no sign of recent occupation; broody in the adjacent nest box. One egg dated 6/17, one 6/18, one unmarked, meaning it's older than the other two, possibly by a couple days (got lax with my dating after 3-4 days), but all 3 remaining eggs are due, like NOW!
I may have been the cause of the broody being off the nest, but not out of the coop eating, drinking, or pooping. The juvies had been loose in their adjacent run most of the day, and one had managed to find its way into the adults' yard, again. I locked the adults into their run while I chased down the escape artist. All the commotion stirred up the adults, who all tried to get through their pop door and into the coop at once, They may have spooked the broody off the nest; no way to tell.
UPDATE
Mystery partially solved. Went to see where broody was. She's still in the next-door nest. I made the executive decision to pull the 3 eggs she'd been brooding, candle them, & stick them in the still-active 'bator in case she didn't resume setting. One's pretty porous and appears to be infertile; no movement seen in the other two. The surprise was that while I had the top open, removing the 3 "abandoned" eggs, I tried to touch the broody; she still had her "don't-screw-with-me" game face on. I soon found out why; I spotted a little fuzzy yellow head poking out from under her! First natural-born chick here, ever! Hard to believe that Momma actually moved an egg around a full partition between nest boxes, or that she hadn't kicked out a clear egg. She must have been there a couple hours; chick's totally dry. Now we'll see how well she does raising & protecting a chick in a run full of adults.
Very nice
Mine just does that all on her own.
Congrats!!! 
I have a clean pen right now... How much space does a Pygmy need? Oh! Two broodies! How much space do seven pygmies need?
