Hi TMK Kutty
Welcome to HealthcareMagic.
If she has an ulcer persisting for so long time , she should consider getting evaluated for the same.the treatment being given is appropriate. She can use Candid
oral preparation for mouth fungal infection
I advise her to take vitamin B supplements to relieve from the symptoms.She should also use a mouthwash which is non alcoholic like HiOra.
Hope I answered your question.If you need more information feel free to mail me.