My RIR pullet that is about 7 months old is acting sick. I noticed about three days ago that she was holding her tail down. This morning she did not come out of the coop and was very easy to catch. I have put her in a small cage away from the other pullets. She is not laying down at all. She is just standing there with her tail down like she is hunched over. It looks like she is eating. Her poop is not normal. What should be white is actually yellow and runny. I can't really determine if it is an egg yolk or not. I cannot tell you if she is laying as I have 13 others that look just like her. All other pullets are acting just fine. I was keeping her caged up to see if she lays an egg. Any ideas would be great. As soon as I figure out how to upload pictures I will do that. Thanks for your help!