My 2-year old Rhode Island Red hen has been acting like she's losing her vision for a few weeks and started to stumble constantly. She also turns her head to the right and left over & over~looking like something from the exorcist! The other hens started to peck at her so I've separated her. I've tried vitamins in her water, flax seed oil on her pellets, vitamin E, red worms for extra protein, but she seems to be going downhill fast. Now she won't even grab a red worm when held up. She's not eating and is listless. I've tried to give her water with a dropper with a little success. Any ideas or suggestions???? I feel terrible not being able to help her.