* Update *
Today she seems fine. She is eating a bit and drinking and pooping a lot. Her tail is up and she is alert. My plan is to return her to the coop later today.
I returned her to the coop just before lunch and she is doing very well. She hopped up into the nesting box and laid an egg, so she was ready to go back. Since then, she has been running around with the others and looks great.