I have a flock of 6 girls (2 easter eggers, 2 red stars and 2 RIRs), one of my RIR's lovingly named 'One Leg Peg' (because she likes to keep one leg bent often) is not acting herself. Yesterday I noticed she was acting different distancing herself from the flock. Her tail feathers were (and are) looking at half mast or facing down and her toosh looks like it's pulsing here and there. I took her out last night to see if there was anything visibly wrong and her vent looked very clean, not swollen, tummy felt fine mushy not stiff, not hot (so no infection as of last night), her feathers looked beautiful, no bugs or mites. Eyes and beak looked great as well. I noticed yesterday she also looked as though she was trying to vomit but nothing was coming up. None of that today though. Today is more of the same behavior, lethargic, tail at half mast, not really interested in eating treats, laying down and sleeping/closing eyes more. Her comb is also flopped over to one side making her look even more sickly-is that another sign of illness? We've raised her and her sisters from day-old chicks back this past October so she is not even a year old. The girls have a coop they sleep in and have food/treats and fresh water in and then a safely penned/fenced area where they hang out during the day and forage. The only thing I can think that could have caused this is something she ate (but I'm very careful with their treats ie fresh veggies/fruits and some table scraps). Any ideas or advice on what I could do to help her?