Thanks everybody for your comments. Very helpful. I'm tempted to let the chick free range with the others while supervised. I'd be afraid, though, to leave her out unattended because of hawks. So far they haven't bothered the big birds, but a young pullet could be easily snatched. Problem in my mind is how do I get the little girl back in the pen? She's fast and won't let me near.
I believe you worry way too much.......The Big hens will look after her...She is not stupid and was raised by a Broody Hen...She was taught lots already my her Momma...Let her go..She will stay close to the Big birds..When they go inside, she will too..
Cheers!