My 5 month Black Star is sick. I separated her from the rest of the flock (which are completely healthy). Symptoms are: Not eating. Very lethargic. Where she would run from me before she is now just standing/sitting there. Her poo is hunter green with the white all runny. Loosing weight. I heard that they can get cancer etc., could this be it? Is there anything I can do? No mites by the way.