I would suggest lots of air time, and when her rash is clear, use vaseline after each change to keep the moisture off of her. Also, Sudocream is the best
diaper rash cream I have used. She may need some hydrocortisone cream to treat the inflammation, but this should be used sparingly and not long term, as it can thin the skin. It's something the doctor can prescribe in addition to the yeast cream.