Unfortunately, when I closed them up Saturday night, I realized that I was missing a bird. Being dark and not having a flash light, I figured I'd double check in the morning. Sure enough, I was down one the next morning - Pretty Feather was missing.
All the following week I kept my ladies in their enclosed yard as I wasn't home to keep an eye on them if I let them loose. But on Friday afternoon, I let them out again to graze where they would (really not sure if this has any bearing on the story or not). When I closed them up that night and did a head count, I came up with 19 birds! What?! Did another head count and got 19 again. Looking more closely I found that yes, Pretty Feather was indeed back with the flock. I don't know where she spent her vacation, but I'm delighted that she's home again.