Hi I have a goldish colored hen I have only had her for 3 weeks, she has some unknown sickness. She came with a australorp which has been with her since. The other hen has not shown any sign of sickness at all except for her odd looking swelled feet. Which I can't figure that out either. The hen sneeze/coughs every once in a while and when I put an ear up to her I here odd noises like gurgle sounds. It doesn't seem to be contagious or the other hen would be sick too Also she gets this mucus type stuff on her beak every once in a while and it stinks. I have been giving her respiratory booster and it has helped some, but what is wrong with her? Would it be safe to add them to the flock? She doesn't seem to be contagious. Although she is highly under weight..