We have a small flock of eight with longhorns, barred rock and ameracaunas which were all hatched in June 2013. All have been very healthy and champion layers for the last couple of months (5-6 eggs daily with a 29 Watt bulb on a timer). A couple of days ago, one of our ameracaunas never left the roost in the coop. We set up a quarantine area in the coop, separated by metal wire so she's separate, but still in the same space as the rest of the flock. We placed a heat lamp a couple of feet above the roost and read that we ought to put some apple cider vinegar in her water, which we've done in her own glass bowl. She continues to remain on the roost. She is pooping. I've picked her up and felt all along her underside and she doesn't appear to be in pain or "eggbound", from what I've read. We're newbies at this and are wondering if this is something we should be concerned about or if it's something more like broodiness. Thanks in advance for any insight you can provide.