I wouldn't think she has both cocci and a broken egg. It should be easy enough to tell the difference, but her symptoms sound like cocci. You should check her for signs of lice and mites, and possibly treat for worms with SafeGuard liquid or paste after Corid. She really needs to drink the Corid, or be syringe-fed carefully so she doesn't choke.
Buttermilk itself is full of probiotics. If she still is acting hunched and inactive later, I would still treat her with Corid and worm her. I'm glad she is eating. Don't feed too much bread, and take it easy with buttermilk. The buttermilk will coat and soothe the GI tract giving her a little more time for you to get meds if she has cocci. Did you figure out whether the yellow slime was poo or egg material?
Thank you all!!! I did buy corid I don't ever want to be in the spot ever again!! Although my husband grew up on a farm I did NOT so this is hard for me.
I had another chicken die but not Zombie chicken she still lives on. BUT she is not much better she isn't humped over but she still walks slowly her poi is the same. Iam still treating all of them with Corid for all my lovely ladies. Oh, I have her away from the flock STILL. What else can I do?