I noticed that my 2 year old silkie was acting anti-social over the weekend and keeping to herself. I checked her over and I noticed she's thinner than normal, her crop wasn't full like the others, and I saw tiny white bugs on her which I think are lice. To make things worse, the lowest ranking hen has been bullying her so I think she lost her rank. I got permethrin powder and dusted all the chickens yesterday. I also brought her inside so she can recover without getting picked on. I gave her electrolytes in her water but she doesn't seem interested in eating or drinking. She looks normal other than being a little thin. I'm going to give her NutriDrench today to see if that will help get her appetite back. My daughter thinks she looks "sad". Is there anything else I should be checking for? How often should I dust them?