These are good ideas too - it won't hurt to see if Vet Rx will help her out. Since the vet was able to remove whatever was blocking her airway (post#30, page 3 of this thread), she may still have irritation to her passages. The VetRx may be soothing to herGet some VetRX for her and read instructions. Also keep her in a warm room or area if you are experiencing cold weather, semi dark, natural light and put some vitamin mix in her water. That's what I would do for her. Has she ever layed? Has she been laying? My guess is she is stressing maybe because of fixing to lay her first egg of season. Could be respiratory too, so VetRX and vitamins should help her get over that.
Being in strange surrounding, noisy area will stress her too. If you have a dog carrier and its not too cold, I would put her in that, back in her hen house. Can attach feed and water cups to door on those things. Put shavings in bottom. And use the VetRX daily on her.