If you had your hands were in there, close to her and babies, it is likely that she was warning the chick to "take cover" under her. Enjoy the cuteness!
Buff Orpington's are great Mama's. The first hatch I took the day off and sat and watched in wonder, but really, she's got this better than we do. I found it helpful to put a cage around her and babies in the coop, so the early birds couldn't stray while she sat on the late hatchers.
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