Enrofloxacin is a stong antibiotic that might treat a bacterial disease, but if it is canker, I think that metronidazole, an anti-protozoan drug, is what treats canker. Has the vet seen her? If you notice a bad odor soon, I would order the Fish Zole online. Dosage is 250 mg orally given daily...
Yellow lesions or plaques inside the beak and throat can be canker, virus (fowl pox,) thrush (fungus,) or bacteria. Is there a bad odor from the beak? Canker is a disease carried by pigeons and some wild birds, and it is said to have a bad odor. Fish zole or metronidazole is the common treatment...