hi there! we have 8 sweet chickens, all different breeds. they are all approximately 10 months old. we lost our two leghorn chickens recently, and now one of my cochin birds is acting strangely. i cannot tell if she is sick or just super afraid of her sisters? she is withdrawn from the flock, neck somewhat pulled in, and hides often. some of the others peck at her, again, im not sure if its bc she is the smallest or bc she could be sick. i did worm all my girls after we lost the first two with ivermectin. she doesn't scratch or dust bathe at all, kinda just hovers in the corner. when i bring her inside she devours seed and water. i have noticed some sticky tail feathers, not from diarrhea, pretty sure she just is so weak and doesn't have energy to stand. she hopped out of the nesting box today and crumbled. another new development, just after she eats she does a weird thing with her neck, almost like she is adjusting something or trying to swallow oddly? she is only ONE pound. please any advice appreciated! i am so sad!