Help me out please, 2.5 year old black Cochin hen that is the leading lady of this all girl flock,never much of a layer tho. She's normally a fat sassy lady but has been uninterested in food (even the treats), lethargic, isolated, pale comb, crop full of water but no soild food (my mate grabbed a bag of loose scratch instead of their normal pellets), she has a lightley dirty bottom (not blocking just noticable on her black feathers). She's been acting off for two weeks but today free-rangeing she's just standing in one spot starting at nothing looking unhappy. What's wrong? Ideas? 25year chicken hobbiest.