Another thought, do you have berries around? or any food source that would create red tones?
She may have eaten something that made a funny color in her poo. Berries and red cabbage and beets can do that.
It wouldn't hurt to treat everyone with a round if Corid, but I hate to do so if it isn't necessary.
If she looks at all ruffled, lethargic, or pale combed, or has any more funny poo, or anyone else does, definitely treat.
Otherwise, I'm thinking it is likely food related or normal fecal...but watch closely. Clean and change out your water sources. Make sure you don't have soggy ground around them.
If you have serious doubt, treat.
LofMc