I have 7 chicks that are 1 month old. One of them is a silkie. At dark, all the birds go into the coop except the silkie who sits under the coop (I have a tractor with run under the coop) and trills or chirps quietly. I try to sweep her out with a broom but she won't budge. She just lets me poke her. I have to crawl in there and grab her. She doesn't resist. When I put her in the coop with the rest of the birds she seems normal enough. Is she being shunned by the others? Is she not smart enough to come in? What is going on? Thanks!