Need help for yeast infection?

Hey,
I writing this on behalf of my sister. She can NOT get rid of this yeast infection and I'm not sure how to help her. I have never had one so I'm hoping someone can advise me. She is not into cleansing, Liver-Flush etc "yet". I'm supplying her with as much info as I can but she is really sick and needs to get this infection under control. She did resort to Antibiotics but it came back worse then before. Any thoughts. Thanks Gayle