Hello! Can you tell me who has had thrush in their mouth?

Hello! Can you tell me who has had thrush in their mouth? My daughter got it after antibiotics and she still can't cure it. We went to see a doctor. She said to treat candidiasis, so I am doing that. It seems like it is going away. But then after 3-4 days it appears again. Maybe there is something else that could help. The pediatrician says all the same thing.