may subsides symtoms for some time.Most likely she is having Tinea Incognito
.In Tinea incognito topical antifungals alone may take several days to respond symptomatically. So she should take systemic antifungals also along with topical antifungals.
keeping in mind the flora(bactrial ,fungal) in this area,it is not advisable to use hydrocortisone cream
Dr Sharat gupta