Get her fixed!!!
The vet is correct in getting the dog fixed ASAP. The area you described being swollen sometimes follows "Heat" in older dogs. I don't want to concern you, but could she be pregnant? That swelling after heat could indicate intercourse had taken place.
Getting her fixed now is best course of action at this point. The swelling should go down soon after the surgery. It doesn't sound like any kind of infection to me at this point. Just natural course of "womanhood".
Scooby, Shaggy the "Dogs", Ms. Thang the "Cat" and introducing Measley Weasle "The Ferret".
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