Keep in mind, even with those treatments if there is a definite and bad odor, as specialmom says, that's not the primary symptom of yeast infections. I mentioned yeast infections first because you said "cheesy." My second guess would have been bacterial vaginosis (BV), as she mentioned. It won't hurt to try an over-the-counter preparation for a yeast infection, but if the smell persists, she should definitely see a doctor and get a run of antibiotics.