I really need to read what I tyoe or this iPad types!!
Have you tried putting a sock over the area?
These can be hard to treat and sometimes it is trial and error especially if you don't know the cause. Did your Vet do a scraping to check for allergies, parasites, etc? Some dogs do this out of boredom or just develop a habit of lucking an area. There is a slight chance there is something going on with the bone in that area. Some Vets try using corticosteroids or antidepressants or antibiotics. I woukd think a scraping if the area should be done and analyzed if it hasn't been done. Have you tried putting a sick over the area to keep her from licking it? You can maybe get a man's cotton sock and secure it to the keg with Vet wrap. You might try a No Bite collar which most dogs will tolerate better then the Eizabethian collar.
Sorry, I don't have much more to offer. You need to work with your Vet and, hopefully, come up with some solution. It might not hurt to get a second opinion.
Good luck and please come back and update.
We are not Vets and can only give what advice we can.