OK so I have 3 birds - 2 hens and a rooster. My rhode island red has started to act a bit strange. She used to be excited when I went over to their run but now just stands in the same spot and looks really tired. She has stopped laying (haven't had an egg in about 5 days, but have noticed soft egg shells). I have been providing oyster shell for them along with layers pellets. What could be wrong with her? She doesn't seem interested in food and doesn't even look when I throw in treats. She will peck at food now and again bit generally just really distant. I haven't noticed anything different with her eyes. Her comb is a bit pale but I don't remember hers ever being really red. I also don't really have anywhere to put her to separate her from the other two. What should I do?