Thanks for the query,
She might be suffering from a mixed bacterial and fungal infection
Usually fungal infections start with an itch and get infected with bacteria.
Take a course of antibiotics.
Apply a combination of an antibacterial cream like mupirocine and antifungal cream like clotrimazole
She can keep using the anti histamine
Let me know if you have any other doubt.
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Wishing you a good health.