i have the same problem. She obviously has too much candida, so therefore a common thing most peopple forget to do is aviod yeast. Your wife must not eat foods that contain yeast, such as bread, rolls, beer, malt products or any other products that contain yeat.
Has she tried Caprylic acid? This is very good for recurring yeast problems both in the intestinal tracks and external infections. Also, a candida supplement from Holland & Barratt is meant to be good, as well as prebiotics such as Prebio 7 (�9.99) from H&B. This supplements do not provide instant miracle cures straight away and she must take them for a couple of weeks to see the benefits.
There is no permanant cure for candidiasis, as the human body always has normal levels of yeast and your wifes condition is created by flare ups of candida. This is caused by external and internal aggressors, especially the diet and stress, which also causes the condition and has a strong link. Sometimes stressing about the condition can make it worse, but i know how stressful it can be. Oregano and Goldenseal root also helps when taken with caprylic acid.