I'm glad her poop looks normal! That's always a good sign!She pooped the moment I put her in the crate on a puppy pad. Her pooped looked pretty normal. Maybe a little dry, if anything. It was too dark to check her poop more closely for any worms. I'd like to do that tomorrow.
I've never found any worms in our girls poop. But I have 2 goats who share the run with the girls. The goats do not go inside the coop. They have their own house although the chickens DO go inside the goat house all the time. Anyway, goats are notorious for worms so I imagine they have to have been exposed at some time. I also have horses but I do a rotational worming schedule for them every other month.
I have goats, too, so I'm always nervous about treating for worms without knowing what I'm dealing with. Resistence is bad juju. I do fecal floats on my goats regularly in order to detect worm and protozoa loads. I've not had to worm anyone yet (knock on wood!). That's why I don't treat without first knowing what they've got.
In your situation, a vet would be good in my opinion, or even just ask a vet to do a fecal float on your chicken if you really suspect worms. But treating with Corid doesn't hurt. Are you still using the Corid? You'll see pretty quick improvement if it's coccidiosis.