We have nine girls who have made it to four weeks so far without any problems at all. Today I have one who is nestled down into the bedding under the heating plate covered herself up with dust and stuff. The problem is when I put her out from under the heating plate she does the same thing and the other chickens come over and pick at her. She is still eating and pooping and peeing. Any advice on what's going on and what I should do? Thank you.