I need help trying to figure out what is killing my hen....she is an 8 month old RR, and stopped laying almost 3 weeks ago. She started walking around with her tail down and her comb started to get pale. She stayed in away from the flock and stopped eating a lot. She still drank and ate little bits here and there, but over the last 3 weeks she has deteriorated. I stared her on Sulmate? 2 days ago in her water and separated her, but now she has lost all body mass and I am trying to figure out the most humane way to euthanize her. Her poop is all green and frothy with little white flecks all through it. Like a seafoam green. No blood....she has been eating up until yesterday, but is just skin and bones now. I am devastated and just want to know what it was that killed her.......none of the other chickens seem sick, and I want to make sure it stays that way. What is the best way to put her out of her misery? Help?! Thanks.