I highly recommend you search for a second opinion. A good doctor must always give a diagnosis or a reassurance about the disease of his her patient.
This are bacterial diseases. No anti fungal cream will cure her. If the current oral antibiotic didn´t work she needs a change of drug.
There are many different types of bacteria some are resistant to a type of antibiotic but sensitive to others. There is no way to know the outcome until we start taking a medication. What doctors do almost everytime is use broad spectrum antibiotics, or attack the most common bacterial cause of an infection according to stadistics.
Seek a second opinion, do not waste time.