almost 3 yrs old, late afternoon yesterday, I found my Isa Brown hen sitting on roost bar when rest of flock was out free-ranging. She had a droopy tail, droopy comb, and labored breathing. Several times, I offered her scrambled egg and yogurt where she was and she only took a little nibble and a little sip of water each time. She stayed in place overnight and other chicks didn't bother her. Her body raises and falls with her breathing. She is inside today under a heatbar. She takes a single sip of water, then 20 minutes later a single sip of probiotic water. She ate a nibble of scrambled egg and some feed mash. Her poo today was all watery and green (pic attached). She's calm and sleepy. I have 2 other Isa Brown hens doing fine (all 3 were raised together). Any suggestions to help her out?