Hi and I am so sorry about what is happening to your daughter.
From the description of these lesions, it sounds like impetigo
which is a bacterial infection mostly caused by streptococci or staphylococci species.
They can occur on normal skin or areas with infections like fungal infections. From what your doctor prescribed, it seems he was managing for a non super-infected probably fungal infection.
Because it is getting worse, I will strongly suggest that you return to your doctor for review of treatment since the current treatment is not working very well.
I hope this addresses your problem and gives you some guidance.
if you need more information, please return to us and we shall be happy addressing your questions.