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I am sorry to hear about your cat. These must be painful! Can she eat and swallow?
My name is Rebecca. I am a veterinarian and will do my best to help.
Have any blood tests been done? Sometimes things like chronic kidney disease can cause ulcers.
If these won't heal, even after being sewn up, I am suspicious that something else is going on. Cats are usually very good at healing, so any sore or ulcer that does not heal should be biopsied to check for things like eosinophilic lesions (which may respond to steroids like prednisolone), or some type of cancer. When the veterinarian sewed the ulcer closed, was a biopsy done? Have steroids been tried?
I hope you were able to see my response; I have not heard back from you! How is she doing? Was this helpful; did I answer all your questions?
I did send an answer; did you not see it?
This could be ulcers from kidney disease, they could be eosinohilic ulcers that require steroids to get better. Ulcers that do not heal could also be some type of throat cancer.
Since 3 different antibiotics have not helped, these must not be infections. Some other therapy needs to be tried. If this were my own cat, I would do a biopsy, to find out exactly what these are and knowing what they are will tell us the best treatment.