Duramycin 10 is used for respiratory diseases. Is she showing respiratory symptoms such as sneezing, wheezing, runny nostrils, bubbles in eyes, gurgling, facial swelling, head shaking? If not, dont use the duramycin. I agree that she may still have cocci and the corid was ineffective in this instance. Do not re-treat her with corid. I recommend sulfadimethoxine soluable powder. Dosage is 1 teaspoon per gallon of water for 3 days. Change it out each day and dont add anything else to the mixture. Since she is sick, she may not drink on her own. Use an eyedropper to put a few drops of the mixture on the side of her beak to drink, do this about 5-6 times a day until she is well enough to drink the mixture on her own.