Don't forget to give vitamins when you stop the Corid. Did you worm again? Will you attempt to tube feed? Since the Corid hasn't helped maybe try an antibiotic?
I feed raw egg all of the time. I used to use on scrambled, but the raw is so easily combined with yogurt or crumbles. If you think she doesn't have coccidiosis, go ahead and stop the Corid. It would be a shame to keep treating if it wasn't that. This is why it is frustrating because they...
To me it sounds like the right thing to do since you seem to have checked out all of the usual threats. Have you checked her for a stuck egg or looked at her vent?