Just wanted to post an update. We let Pepper chicken out for a while this morning between rain showers. When she first went out, there was no visible limp at all. As she stayed out for a while, though, she began to limp. We definitely think it was a less severe limp, though. She was happy to see her sister, and ate some grass and drank out of the mud holes. When it began to rain harder, they started looking for cover, so I went out to get her and brought her back in. Maybe another day or so and she'll be able to return to the coop. Certainly looks like progress to me.
Thanks for all they help y'all have given!!