I'm very skeptical about a low fat, high carb diet being helpful for a yeast overgrowth. Even if the sugars are being digested and absorbed quickly, they are still in the digestive tract for awhile, where they will feed microorganisms. But it is interesting that this diet seems to have worked for this woman.
I will say that I don't think a VERY low or no carb diet is the best answer either, and it may even make a fungal overgrowth worse.
This is from an article on the "Perfect Health Diet" website. This guy promotes a paleo-like diet, but one that is not too low in carbs...
Another Low-Carb Risk: Impaired Immunity
Low-carb diets generally improve immunity to bacteria and viruses, but not all is roses and gingerbread.
Low-carb diets, alas, impair immunity to fungal and protozoal infections. The immune defense against these infections is glucose-dependent (as it relies on production of reactive oxygen species using glucose) and thyroid hormone-dependent (as thyroid hormone drives not only glucose availability, but also the availability of iodine for the myeloperoxidase pathway). Thus, anti-fungal immunity is downregulated on very low-carb diets.
Moreover, eukaryotic pathogens such as fungi and protozoa can metabolize ketones. Thus, a ketogenic diet promotes growth and systemic invasion of these pathogens.
As the fungal infection case studies on our “Results” page illustrate, low-carb dieters often develop fungal infections, and these often go away with increased starch consumption.
Another issue is that mucus is essential for immunity at epithelial surfaces, and glycosylation is essential for the integrity of cellular junctions and tissue barriers such as the intestinal and blood-brain barriers. Thus, reduced production of mucus can impair intestinal immunity and promote gut dysbiosis or systemic infection by pathogens that enter through the gut.
Finally, a very low-carb diet is not entirely free of risks of gut dysbiosis, and not just from fungal infections. Bacteria can metabolize the amino acid glutamine as well as mucosal sugars, so it is not possible to completely starve gut bacteria with a low-carb diet. Nor is it desirable, as this would eliminate a protective layer against systemic infection by pathogens that enter the body through the gut. As our “Results” page shows, several people who had gut trouble on the very low-carb (and generally excellent) GAPS diet were cured on our diet.
Also... since both good and bad bacteria thrive on carbs, I wonder if eating very low carb might kill off too much good bacteria, which are needed to keep yeast in check. I guess if you take probiotics this may be less of an issue.