ok so most of my hens stopped laying shortly after we brought in a rescued hen. I assumed they were mad at the new addition plus the weather has been weird. Then I noticed an excess of barred rock feathers so I assumed they were molting - and one in particular looks much smaller and you can see all of the new spikes from feathers coming in. I noticed Tuesday/Wednesday when I went to refill their feed they the remainder in the bin had gone bad, was moldy and stuck to the bin. I gave them some scraps and Friday cleaned it out and gave them new feed. Now what was rinsed our they ended up getting into and eating. That same day I noticed when I let them out of the coop that the one who lost the most feathers stumbled some. Saturday, when I let them out, she was stumbling like a drunk person and I noticed her comb was flopped over but the color is normal and so is the size. I took her to the vet and they think it’s the food, but she is still like that today. She isn’t lethargic, eating and drinking fine, normal poop - just looks like she is molting and drink. None of the other four seem to have any issues except I think the other barred rock is molting too, not 100%....ideas?