My wife and I are new to backyard chickens so any experience of feedback would be very helpful. Our cute little faverolle hen died this morning and we are very sad. She was about 12 weeks our and we have had her since she was 8 weeks. She was always smaller than the rest of our hens(different breeds) but wasn't growing at nearly the same speed as the others. Ever since we got Boots always looked like she was trying to cough up a hairball and would sit sometimes with her eyes closed and just open her beak and stretch out her neck. Last night that was pretty much all she did. She also barely ate or drank last night. She would often spit up water if we picked her up and last night her eye was a little bubbly looking and she almost sounded weezy and wet when she breathed. We separated her last night from the rest of the group but I am worried if she had something more dangerous that it is too late and that the rest of flock may be in danger. We are very sad to lose Boots but our main concern now is making sure that the flock is healthy and will be okay. All of the other hens are growing and eating tons, food scraps, feed, grass etc, and seem to be doing very well. Any idea what may have caused Boots to get sick or what she had or what we should do to ensure the safety of the other hens?