Hello! I'm a new Chicken Mom! We have 4, 7-week old Buff Orpingtons... they are still inside in a temp controlled pen. Of the 4, we have 1 rambunctious one that I'm worried about. She seems somewhat "puffed" up and tucks her head in- just like she's hunkered down ready to sleep. She appears to be eating and drinking... just doesn't seem her usual fiesty-self. We had moved the lamp slightly to get them acclimated to a slightly cooler temp (down from 80 to 75) about 4 days ago. Wondering if I should be concerned? Should I separate her from the rest as a precaution? Or is this just a new "personality-trait". This just seemed to have changed in the past 36-48 hours. Thanks!