Hi A.,
Oh, I feel for your baby. let her air dry her bottom as much as possible. I'd prep her bed so she could sleep bottomless for a few days. I know that will be more laundry for you ... but I think it may do wonders for her. also: I'd change everything: laundry detergent, baby wash, shampoo, etc. no laundry rinse nor dryer sheets. she could be reacting to that. no bleaching towels. if it's fungal infection... use tea tree oil along with your organic cleaning products. spray the tub with vinegar after each bath. and also clean it w/' the natural cleaner + tea tree oil. (good for killing mold/ fungus) (same for cleaning the shower -in case it's separate) I'd give her showers instead of long baths... if sitting on mild warm water helps, perhaps you can also add epson salt to the bath water.
check her diet. is she allergic to anything? sometimes food allergies can cause eczema which in turn leaves her skin more suseptible to the fungal infections. get info on getting rid of candida (yeast).... that means no sugar because sugar feeds it. if she has not been tested for allergies, I'd consider it. My godson is allergic to soy and that flares up as eczema (in every which part of his body). my neighbor's daugher... her eczema is triggered by ragweed allergy --which includes: dandelions, lettuce, artichokes, sunflower, safflower, chamomile, echinacea...just to mention a few. nowadays they put safflower and sunflower oil on just about everything. so check out her lotions too. you can use organic olive oil as a moisturizer... no additives, no fragances, no nothing but olive oil. it does wonders for the skin and hair. you can also get organic coconut oil and use it too.
question and google everything until you find out why or what is making her skin so suceptible to those infections. let me tell you that doctors (love them) may tell you that diet is not affecting her....smile, don't get mad, but keep looking for answers. this will make it a bit longer, I'll be brief. case and point: my son kept getting sinus infections just about every month. I told his doctor that I thought it was milk... he said oh no it's not milk it's just allergies (we live in TX). well, I went milk-free for a while...dindn't have to see the doc every 4 weeks...when we went back he was surprised that we had not been there in several months. I told him that I took milk out of his diet. then he said to keep him off milk for another year and see how it would go. for the next school year he signed the note about my son's milk-intolerance. We love our doctor but sometimes they don't take nutritrion into account as much.
Sorry this got so long. I just want to encourage you to keep looking and questioning everything until your baby's bottom is as it should be. =)
oh, may want to consider giving her more pears (so she doesn't have to push too much... don't want it too soft so it spreads everywhere but at the same time, pushing may hurt too) --sorry if TMI
oh another thought... may need to do a round of laundry with some tea tree oil added to the clothes to get rid of any traces of any fungi.
Remember that you are a part of the team trying to figure out what is going on with your daughter and your opinions are valid too (although sometimes they may be somewhat ignored). Good luck and God Bless! ~C.~