Please help. There is something wrong with my SL Orphington chick.

I woke up this morning to feed and water my babies and noticed one of my SL Orphs acting very strange. At first, I though she was just preening her chest/abdomen but continued to watch her and she won't stop. I picked her up to see if there was anything there that could be bothering her and found nothing but she kept her head tucked the whole time trying to scratch/preen. She keeps her head bent under her breast and acts as if she is preening or scratching her abdomen at all times. Her balance is good and nothing wrong with her legs, eyes or anything else for that matter. She hasn't taken any falls or spills that I know of. It seems neurological but I am far FAR from being and expert at this kind of thing and I am fairly new at all of this. I have never seen this happen before and was wondering if anyone had any clues as to what could be happening? The chick is about 17-18 days old and the other SL chicks, that hatched with her, are doing just fine. Please help if you can. I love these babies and it would be terrible if I lost one. Thanks in advance.

 

This is what she does at all times.