I have 4 chicks who are almost 9 weeks old (3 x light sussex and 1 x breed unknown) and they are hen raised. Two weeks I moved them to a bigger run, together with their mum. A few days later I noticed the chicks had diarrhea and they were all getting dirty bums (probably some bacteria from my other chickens that had been in there before?). One chick (the one who's breed is unknown) seemed in very bad shape so I took her out and put her in a crate inside. She was very weak and I thought she was going to die but luckily she ate and drank well and she recovered a bit. (The siblings recovered in a couple of days by the way). Two days ago I tried to put her back with mum and her siblings but I soon found out she was still too weak and even fell over. The mum noticed this and started even pecking her! So I took her back inside, but she doesn't seem to improve very much. She drinks and eats well and is very vocal when she's awake, but she falls asleep a lot and still looks weak with her wings hanging a bit. I thought she might not get enough stimulation to regain her strength so I decided to take the smallest sibling out and put him in the crate together with her, but also that hasn't really worked so far... Has anyone any other suggestions or advice or had a similar experience? How long can it take before she gets well enough to go back with her mum? Thanks!!!