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It sounds like she may have a yeast or bacterial infection. If this is in the vagina/ vaginitis, then yeast infections are fairly common. They don't always clear up with just wipes. Many times we need to use oral medication. I typically use a combination of an oral antibiotic (Cephalexin) + an oral anti-fungal (Ketoconazole). I would do 7-10 days on both and this should clear up nicely.
I hope this helps, let me know if you have any other questions.