My 10 week old EE has been acting strange...At night I put all the chicks (all same age) in a large brooder so they will be safe and secure (we are as-we-speak building a coop). During the day she wants to just hang out in there and not eat or drink unless I take her out and put her at the food. When I lifted her she seemed rather light. I picked up one of the other EEs and it felt much heavier, so she is loosing weight. I am stumped. She is not old enough to lay eggs, I have checked her feathers and vent and have not seen any lice or bugs. All the other chickens are fine. Is she depressed? Sick? HELP!!!