I have an Amber Star that just started growing her feathers back after molting and she went a couple weeks where she wouldn't even budge out of the coop, I think she was embarassed because she wasn't looking her best and it didn't help that the couple of times she did venture out of the coop my old Delaware rooster (2 months old) and a Barred Plymouth Rock hen would attack her and actually bloodied her up one day while I was gone, I since rehomed the rooster and the hen and got her some new friends. I know that's not the same situation as you but them staying in the coop is somewhat normal ( or so I was told by a friend that raises chickens but don't quote me on it ) as for the puffed up and haunched up (unless they are actually sick), they sometimes do that when they are cold, I think they do it to help warm themselves up. Do you know anyone that could "chicken sit" for a day while you are at work so you could see if they actually eating and drinking alright? I know Wilma (my Amber Star)got really skinny while she was molting, but that was just because my bpr hen and the Delaware roo would chase her away from the food, I started leaving food and water in the coop with her and now she is back to her normal weight. Just keep an eye on them and if they get any worse maybe call a vet or even Dunlap Hatchery in Caldwell might know what to do. I know I almost made all of my hens a chicken saddle, and I still might to help keep them warm through the winter. Wilma is starting to grow her feathers back and she still has her days where she just stays in the nesting box and won't come out of the coop, but I make sure there is always plenty of straw in the coop to keep her and my 6 other chickens warm. If the 3 refuse to leave the coop try leaving food and water in there with them and get them a thing called a chicken block (it has extra vitamins and nutrients to help keep them healthy and warm through the winter), I am not sure what it is called but I know Zamzows and D&B sells them. Depending on where you are at, I have an extra waterer(it is only one of the mason jar waterers) if you want it, I bought a Heated 3 gallon waterer so I don't use the smaller one anymore. Also try getting cracked corn for them I hear it helps them stay warm in the colder months. I wish you luck with your flock and hopefully they are all OK and healthy. Sorry about the "novel" I hope it helps.
