I thought my cochin was molting because she just came out of being broody and now there are feathers EVERYWHERE!! But as the days go on I realize she's only losing them from her vent and now today it just looks so raw(which might be normal) but all the feathers around that area look wet and it might just be my imagination but it seems like every now and then she stumbles a little bit. My other 3 hens are fine and I dusted them with poultry dust a little over a week ago and will do it again in another 2 days. Every time I look in the coop I can find a few mites. So...what might be wrong with my hen and whats a good way to completely get rid of the mights? I already dusted the coop and run with DE and poultry dust. Should I spray it down with bleach or will it soak into the sand(the bottom of the run is sand) and harm them?