My husband and I just bought our first chickens in December for Christmas. We got 3 hens and a Rooster all barred rock. They were said to have been really good bloodline and healthy. When we came home one of the hens started having a bubbly eye and a cough after a few days so I googled and through some websites found she needed medicine. So we kept her separate for a while ( a week or two) and gave her VET RX till she really seemed to be better. She now is laying eggs for us but I have noticed that she has started coughing again and shaking her head. she always has seemed healthy and is the nicest out of the bunch. but today I went out and she had watery poop. I looked it up on here and found that maybe its just because its hot out (which it really isn't super hot just warmer than its been). I went back out just a little while ago and she is just laying in the coop with her head tucked under her wing. I went to pet her and she didn't even move for a little while!!! What's going on, is she diseased?? She's sweet but I don't want to get the others sick. Please help! Thank you and God bless you!