What food are you feeding?
I am not sure about the ointment. Have you had the Vet check her and do possible skin scrapings or allergy testing?
Try bathing in a mild oatmeal shampoo for dogs.
On localized hot spots, usually at the base of the tail, I use a diluted solution of Betadine and water. I soak a couple of cotton balks in it, wring about half, part the hair and squeeze the liquid on the spot and dab it with the cotton ball. Take your fingers and separate the hair. Does that make sense? I would do this twice a day. Or, call your Vet and see what they recommend.
These things can be hard to figure out. Could be some skin issue going on, food you are feeding, contact dermatitis, something outside or being inhaled.