UPDATE: Throughout the day I went out and made sure the black chicks were getting enough to eat/drink. It's almost dark now, and it's very dark in their brooder area without a light, and so I was able to tuck everyone under her for warmth for the night while she just clucked away, very happy...
I have a broody hen (Buff Orpington/Barred Rock cross) that hatched out 2 Buff Orpington chicks Monday (Aug. 5th). Because of the poor hatch rate, I quickly ordered some chicks with the hope that she'd adopt and raise them. I ordered 6 Barred Rocks, 5 Black Australorps, and 5 Buff Orpingtons...