40°F is the wind chill temp?Ok, so I have her set up under our blue tarp area in the run. She has a roost she’s been sitting on for most of the afternoon. I am going to keep her there overnight tonight and see how she does (temps going down to 40degF with winds tonight).
Make sure she's blocked from the wind.
That towel on the roost may be defeating the purpose of giving them nothing to 'set' on.