Hi Rosie,
I had thrush from the second week of radiation on for about 6 months. I took Diflucan and Nystatin and nothing helped. I ran a terrible fever for a while so had some antibiotic, however, I had no vomiting or nausea.

Finally a doctor in the dental dept put me on Dexamethasone Elixir USP 0.5mg for two weeks. This is some kind of a steroid, but it cleared it up in the two week period. This was 5+ years ago so medicines may have changed, but if she doesn't improve you might ask.

Subsequent to that bout, I had a prosthodontist tell me that when you have thrush you should not eat any sugars or anything that can turn into sugar, basically anything white - potatoes, rice, milk, bread, pasta, etc. - anything made with white flour that turns into sugar. Thrush feeds on sugars. So NOW THEY TELL ME.

Hope that helps and she is feeling better.