Dean, if she has already started antibiotics the wound should start to dry up within about 7 days, but I would assume that your vet has asked to see your dog again to monitor it as a two inch wound is quite large. Sometimes there can be a secondary infection which may need different antibiotics and I would expect to see her with a satelite dish around her neck to stop her licking it. The teat or area of gland infected may be permanently damaged and she could end up dry in that area if she is put in pup in the future. The infection has to be treated first, otherwise your dogs body won't be able to fight the infection and repair the damage at the same time. Always follow the advise of your vet, but if you don't like what you hear go to another for a second opinion. A good dog his hard to replace.
I'm not a vet and luckily have never suffered this problem with any of my own dogs, but have seen it before when I worked in a vets.
ATB
ADE