I have a 7 month old Red Sex-link pullet that has an electrified appearance. All her feathers are standing up, especially on her back. To me this tends to indicate discomfort in chickens. However, she's acting quite normally, and has been like this for over a week. She not hunched up or stationary, is moving around and eating and jumps on the roost at night. It makes her look almost like a Frizzle. I have over forty chickens so I can't tell if she's laying. No other birds have similar symptoms. She's not broody, either. She doesn't display any other signs and I have a large flock, so from searching on this site it doesn't sound very much like cocci. It is very cold, but other chickens would be showing similar behavior if that was the cause. Any ideas?