I would be treating her with Corid, not just the others, and worming her with albendazole. With bloody poop, I would treat for worms and possible coccidiosis. Antibiotics are more for infections, such as a reproductive disorder. And those should be given directly by mouth not in the water. You could continue the antibiotic as well but just by giving it orally. If you put the vet’s dosage here for us, I could help you. Normally amoxicillin dosage is around 57 mg per pound given twice a day for 7-10 days. Just my opinion.