I have a chick that is a 5 week old RIR that I have been keeping in the coop with the rest of the chicks with a heat-lamp. She has been acting really strange for the past day --she is usually VERY spunky and is always the first chick to the coop door when I open it-- She is now standing still...eyes close every now and then...(Moving around slowly) (runny yellow-green poop). Please help me! I am very new to this so I am not sure what's wrong with her? She is drinking but barely eating her feed. Could she be over-heated by the lamp? I just positioned the heat lamp a little higher and the in corner of the coop just in case.. She does almost have all of her feathers. I'm so worried!