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Well, we removed her again. I found two more injured chicks. One little silky had an eye swollen shut & covered with blood and the ear oozing blood. And a cute little Cornish just not moving right (honestly that might be something else - no external wounds and DH said he was like that yesterday - he squats on his hocks, low to the ground and rarely goes anywhere, he's alert but it's like it's too much trouble to move. No visible wounds, legs seem normal but aren't working right. He's improved a little indoors.) Momma seemed to be acting fine this morning when it was cool, and everyone looked ok. But at lunchtime I found the bloody silky and witnessed mom beating up on the other chicks, and she seemed to be hitting them harder and more frequently, and it seems painful to them. The few little pecks I've witnessed the chicks doing to each other don't seem nearly strong enough to cause the damage I'm seeing. Anyway, I can't prove it's mom but I just decided it's less risky to raise them without mom. She wants to get back to them. 
Thanks to everyone for all the advice & support!
so sorry it has to be this way, but you know whats best for your flock. I hope all the little ones recover, you might give the lthe little cornish some vitamins to see if it will help strengthen his legs.. Poly- vi- sol w/o iron or save-a-chick.