I would stop using CDs temporarily, wash them in HOT with 10-20 drops of grapefruit seed extract in the final rinse cycle (it kills all kinds of bacteria and yeast), and dry on HIGH heat. Then I'd wait to put her back in CDs until you're certain it's not a yeast rash.
Because if it's a yeast rash, then you're reinfecting her with the CDs, basically. Heat and GSE will kill off the yeast. But if she's got a yeast rash then she's reinfecting the dipes, which are in turn reinfecting her. So I'd lay off the CDs briefly.
Also make a solution of GSE and distilled water (scroll down this page
for instructions). Apply to diaper area with every diaper change.
If you're wanting to use a yeast cream, get the clotrimazole-based kind. It works better than miconazole-based ones.
Continue to keep the area as dry as possible.
If after a few days it isn't improving then I would start to look at possible allergies. And would try the nasty Desitin (again, NOT with CDs -- it will ruin them) along with the GSE. It's a good barrier cream (albeit not enviro-friendly), but it wreaks havoc on CDs.
1. External -- soaps, detergents, lotions, diaper fabric, baby wipes, etc.
2. Internal -- food, medication, anything in your diet if you're still nursing
For the external, we've found the most innocuous products are the California Baby line. For detergent, we use Charlie's Soap liquid which we love.
The detergent you're using, All F&C, has brightening dyes that leave a purposeful residue on the diapers. If you're needing to stick with a mainstream brand, try Arm & Hammer Essentials Free
(not the Mtn Rain -- it has added perfumes your LO could react to). It's got no additives (truly) and might work better for you. Ecos Free is another good one.
Here are two sites with lists -- you want NO or green dots across the board (and NO castille-based):http://www.pinstripesandpolkadots.co...entchoices.htmhttp://www.diaperjungle.com/detergent-chart.html
Also, what are you using for a wipes solution?
If it's an internal allergy issue, I'd eliminate all dairy, soy, berries, and gluten from her diet. Then reintroduce ONE at a time. When you reintroduce dairy, start with yogurt, then cheese, then milk/cream. And give each food a few days to see if there are reactions to it, before introducing another food.
Do the same with your diet if you're nursing.
And keeping a food diary can be a BIG help. We discovered that certain foods aggravated our toddler's tendency towards yeast outbreaks. And also giving her high quality probiotics also helped reduce those outbreaks.
But there's a chance your LO's issues aren't yeast. Still, that would be the first thing I'd treat for again, just to rule it out entirely, since yeast is very difficult to kill off sometimes.
I'm so sorry you're dealing with this and hope you're able to find a solution.