J.D.
I hope that the doctor has been having you give her probiotics as well. Go to Whole Foods, Sprouts, Henrys, and talk with the person in the nutrition department and let them know what you need, a good probiotic for a 5-y-o who has been on repeated rounds of antibiotics.
Is she taking bubble baths as these can cause them if there is a lot of 'junk' in them such as sodium laurel sulfates, dyes, perfumes.
Reduce the amount of sugars in her diet and IF she can swallow pills you might want to consider cranberry extract. Once again, speak with the person in the health food store.
Her ph is out of balance probably and you need to get it back into working order and wiping out the immune system is not one way to do that. I would look into Vitamin D3 supplementation / drops are available, reducing acidic foods (less sugar, red meat) and increasing alkaline foods (more vegetables).
Regarding D-Mannose, never heard of it and when I look it up, I am completely bewildered as to why a doctor would prescribe it so do share when you find out :o)