I'm sorry to hear that! i may have the same problem, I was given these ten chicks and have been raisin them since they were a week or so old. Oh my chicken! How fast they grow. I'm living in a 10 by 12 cabin built with a chainsaw, my coop 5 by 7 is built from the same rough cut lumber(also built with a chain saw) a recycled old dog kennel wrapped with chicken wire.
I'm basically my own vet...
I don't drive and town is 28 Kms, could walk or bike if serious illness came about. My cell only works in some places on the land.
I gave her a warm bath. she seems to be better now just hope it's not going to spread to the others.
I have given them:
oranges
Leaf lettuce
cucumber
scrambled eggs(as bad as that sounds)
Little Olive oil with egg shells
They like ferns, I've heard there poisonous to goats would that be the same for chickens? Goats will eat around them
I'm contemplating using straw or sand for the flooring. Any thoughts?
I just not sure the steps I should take, I've been keeping a close eye