Okay HP I am going back to the bottom sorry!

Vasoline holds in heat. Next time you get a little burn apply some you will see what I mean.
A@D ointment awesome for just after baths but also can hold in the heat to some degree. But has great healing /protective qaulitys. If the skin is peeling and real raw get some neosprine with mild pain meds in it. Let her wear sissys pantys at nap time or no diaper. you might be faced with a little mess to clean but the air will do wonders. And then the biggy no juice of any sort. Acid acid acid. Koolaid or pedialite. Cannot give her any anti dirreha meds do to her age. Unless they have came out with one only for kids in the last few years (rye syndrome). But bananas and peanut butter. Aveno baths frequent even if that is a sink bath.
Let her dry throughly before ointments (girl yeast infection risk).

And yes I know you have done this before. I just remember S15 and how bad and fast his bottom would tear up after simple things like a change in water types (well or city)
And S13 had rodo virus which left him raw and infected and hospitalized. So I know how terrible it is to watch your child walk all cowlegged and thought I would pass on what I learned from it.