From your vet's notes, it appears she tested positive for the cocci bacteria and she is allergic to it. Lady has the same problem. She is allergic to staph so we battle skin infections all the time. Some dogs, especially dogs who are immune compromised like Lady (diabetes) have allergic reactions to the normal bacteria found on and in their bodies.
Has you vet ever suggested adding fish oil/fatty acids to her diet? That has really helped Lady. I give her 3V caps.
Here is some information:
Fatty Acids for Allergies & Dry Skin in Dogs
What do you feed her? Diet can make a big difference, too.