Today I noticed that one of my hens is acting very lethargic, just standing around all puffed up. Normally she is fairly skittish, but now I can get up close before she bolts. I gave her food and she pecked at it a bit before leaving it. She appears perfectly normal, except for the cloaca, which appears perhaps a bit runny and inside a bit may have the tiniest spot of blood. A few weeks ago, I saw that her eggs had very small blood smears on it, but I haven't recently. I know that once a bird starts showing signs of sickness, it may be too late, so please help!