The yogurt is not the problem, the sugars in it, or any fruit, is. Actually, completely plain yogurt (the kind with absolutely NO additives or sweeteners) can be an effective natural treatment for yeast infections.
I won't even discuss the cheese. Tell you what, you tell me what you think about the idea of introducing non local microorganisms into a dark, warm, moist environment? It's not normal that some women constantly have yeast infections, vaginitis/vaginosis, and UTIs. Vaginas are only self cleaning up to a point. It doesn't take very long for some funky critter to take hold and set up housekeeping.