Hi, I just got 3 one-year-old red sex-link chickens about 3 weeks ago from someone who could not keep them. Great layers, an egg each every single day. Then last Saturday (1 week ago) one chicken started looking droopy, got diarrhea. She had laid an egg in the morning, got sick in the afternoon. She has been like that for a week now. No eggs from her the last 7 days. No signs of trouble in the other two chickens. Sick chicken will be perky for a while, seems to be eating and drinking, but then she will kind of relapse and have more diarrhea. Some days the stool has been firmer, then some days watery again. She will go up into the coop (attached to run) and hang out in the nest box sometimes during the day. They eat regular chicken pellets, lettuce from my garden, some weeds and bugs from the garden that I throw in the run (but stopped this after she got sick), and some scratch I got from the previous owner. I have also given them a little yogurt this week. I felt her crop and it has changed size - sometimes full, sometimes less. She looks really big overall, but might just be fluffed up. Since I'm so new to chickens, I'm not sure whether this is serious or not or what to look for. Also, I don't really have a place to put her away from the other two chickens right now. Thanks for any advice.