Newly Single-Mama. Raising homebirth baby, Josephine, July '09.
If it is yeast it has nothing to do with potty or not. Grown women get yeast all the time. If she is in cloth, diapers or panties, they need to be disinfected or replaced or she will just keep getting reinfected.
Motherlove has a great salve for rash and thrush that might help. Plus plenty of probiotics Also a low sugar diet.
We lost my fil a few years ago and our 2yo dd who was close to him took it really hard too. Also we pt pretty early but I expect occasional set backs from them and especially with big changes in their lives. I would work on treating the yeast and helping her deal with life right now and not worry too much on the pt yet.
If it's actually yeast, it's not from the diapers. But, if it's a rash, it could be from the diapers.
You need to treat the yeast infection though. You can do it with regular women's yeast medication that you buy in the store, or ask in your health food store for anything they have that will help. For me, personally, I like the Pearls Yeast kit. But, I don't think it's something you want to give to a child without learning something about it first. http://www.amazon.com/Enzymatic-Therapy-Pearls-YB-Caps/dp/B001V6O39Q