I have an almost 3 year old hen with green diarrhea and an enlarged, soft and squishy belly. I just noticed she has labored breathing at times too (after exertion - jumping up on roosting bar or running while free ranging). Her color is good (comb and wattles) and for the most part, she's keeping up with her mates. Any ideas of what might be causing her symptoms? What I can do for her?