WOOT! I have another chick this a.m.! Mama hatched the only EE cross egg she and the BLRW were sitting on! That makes 2 chicks now, and both hens are sitting on 3 more eggs each, with 1 visible pip. (That pip might have been the one I saw last night, though, not sure.)
Kedreeva, I read your reply to me after I'd already moved everyone. DH and I set up a 36 sqft dog kennel, he made a 2x6" board barrier around the outside, and I moved the whole kit-n-kaboodle (cardboard nest box with Mama, chickie and the rest of the eggs in it, then BLRW hen) in underneath a dogloo. There's food for babies and mamas, plus water, sheltered with a tarp to protect from rain and sun. I'm hoping it'll work... I didn't have anywhere else to put everyone to keep them separate from the rest of the flock (and the rest of the flock out of the chick crumbles), and wanted the mamas to brood rather than to do it artificially. Fingers crossed I get more little ones!