Oh, sweetie, I'm so sorry about Bandit. If you can, you might try to bring her in and put her into a clean dog kennel with clean bedding where she could get a lot of rest and not have to compete at all to get to the food and water. I am certainly no expert, but from all the posts I've read, the first line of defense is to separate and make your chicken very comfy. Bless her heart. I'm praying that getting back on feed will help her perk back up. Good luck.