I have a 3 1/2 month old heritage Rhode Island Red who has started acting strangely this week. She's been very lethargic, falls asleep where she's standing, eats & drinks- but not much. Doesn't move much, has bad balance and drags her wings most times. She doesn't talk much now, allows you to do anything to her without fuss. (Check feathers, undercarriage, look in beak, etc) she was staying away from the rest of the flock, usually hiding under a bush, and is now inside since I noticed something was wrong. Now she stays in the corner by her nest box and food/water. If you put her in the middle of the room, she slowly walks back to the box. Her poop is infrequent (she's not eating/drinking as much as normal), liquidy and smells rancid. (Like rotten eggs) I've included a picture of it... Sorry, but I really need to know what's wrong with her!!! Any help would be appreciated! 
