Probiotics are definitely a good idea. Our clinic recommends one containing both acidophillus and lactobacillus; there are several formulations that include both of these. Has she been given a cream or ointment to put on the rash (regular diaper rash stuff won't work for this.) That should help a lot too. My son ended up with this kind of diaper rash due to abx when he was a baby and needed an antifungal cream; w/ this being worse for a baby girl I imagine this could make a big difference.
I hope the ENT can help out; glad that appt. is soon.
I hope the ENT can help out; glad that appt. is soon.