Do you have the name of the creams?
I know this is a longshot but do you happen to have the name of the bacteria they were able to culture?
Are the pus filled "dots" pretty small? Kind of like acne?
How are her feet? Does she have dandruff? Itchy scalp?
This is an extremely odd question but does your daughter (or her rashes in general) smell like Corn Tortillas? Or do they smell sour? Any other remarkable smell?
I have a couple of "home remedy" type ideas since you requested them.
Does your daughter have allergies (environmental or contact type)? If so, she might be having a response to your laundry soap (even if it claims to be low allergy detergent). I am super sensitive to soaps in general and have found that adding an extra rinse using a cup or two of White Vinegar in the cycle helps to remove the soapy residue. Dont add any liquid fabric softener to the wash at all. A lot of people have sensitivities to it. For the dry cycle, dont add fabric sheets (again a lot of people are sensitive). Also, ensure the clothes (especially underpants) are completely dry. Hanging them is best especially if you live in a humid area.
-- The vinegar also helps reduce bacterial and fungal growth in the clothes.
-- I might try to stop using bleach in the wash cycle as well. If her underpants are mostly white (and you bleach them) there might be some bleach residue left in the underwear. The fact that they are so close to the skin may cause irritation in this area. (Regarding the ear irritation.... I dont know how it applies....)
One of my favorite home remedies is bathtime.
If your daughter takes baths anyway (and the doctor hasnt restricted her to shower only to reduce spreading), a nice, relaxing, warm bath with about 1/4 - 3/4 cup of regular table salt or half salt and half baking soda mix (no soap) may help.
-- Why? The skin is completely covered by "helpful" bacteria that prevent "harmful" bacteria and fungi from being able to access the skin and take hold where they can invade and infect the skin. These "helpful" bacteria like a little salt in their environment. There are other bacteria that may be causing the infection that will be inhibited by the salt. Fungi like salt too so if the cause of the infection is fungal the salt bath may make things worse (probably not likely if you use the lesser amount of salt).
-- Before immersing her entire body in the salt bath I would try to mix up a glass with about a teaspoon or tablespoon of salt and try the "patch test". Get a clean cotton ball and clean a couple inch circle (work the circle inside to outside) follow this with a clean cotton ball dipped in the salt water (work the same area start inside circle to outside), repeat a few times. Maybe a couple of times a day (use fresh cotton, fresh salt solution). You should see if this will have an effect pretty quickly. 1-3 days.
Speaking of "patch test", I always do this test for myself or my husband if we have a rash or skin irritation that wont go away. Two different patches with two different medications (at the same time).
Patch #1 -- What happens if you put a small bit of neosporin on the affected region (one inch area). *Please dont do this if she is allergic / hypersensitive to any of the ingredients in neosporin*
---- Patch #1 will often become worse if the infection is fungal.
wash hands between testing of patches (or use disposable Q-tip for each patch)
Patch #2 -- The active ingredient in Lamisil Cream (terbinafine hydrochloride) is excellent for fungal infections. Repeat the patch test just as in Patch #1 on a different area using the Lamisil (keep them as separate as possible). Lamisil is pretty expensive but the generic is almost as good (as long as it has the terbinafine hydrochloride ingrident). Use the cream not the spray. The spray does not work anywhere near as well.
---- A similar premise holds here. If it is fungal it should get better, if bacterial it should get worse (although I have seen this medication work on bacterial infections as well). You should see a difference quickly (maybe in 1-2 days or less).
For the patch tests I would keep her regular creams away from the patch test areas so you can get an independent test result.
*Has she seen what happens when not using the cream (or a patch that she doesnt use the cream)? It is possible to get a hypersensitivity to medications in the creams.
The other thing I can think of offhand is hydrogen peroxide. The "beneficial type" bacteria produce a substance that causes the hydrogen peroxide to bubble and break down. *Some*, but not all, of the bad bacteria do not have this substance and the hydrogen peroxide can kill them. If she has open or bleeding wounds her own cells may cause the bubbling reaction and/or be damaged by the hydrogen peroxide. If you want to try, I am thinking patch test with a small area?? Maybe try this if the Patch Test #1 and #2 doesnt work?
I hope it helps. Let me know if you try any of these and whether or not they work.
I hope she feels better very soon.