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?