Not sure about the feather loss, but isn't it fairly normal for lots of hens to stop laying through the winter? Mine have all moulted at different times, some came back into lay before winter but then stopped again, some just stopped to moult and stayed stopped (if you see what I mean) for winter and some young ones started laying just in time to get me through the winter months. But I've never had a hen moult in her first winter....doesn't mean it doesn't happen but I think it's normally the end of their second season.