I wouldn't cull her. Years ago there was someone with a little silkie roo and he had tons and tons of maggots, they worked on him for weeks and finally got them all cleared out. They used hydrogen peroxide to bubble them out. But, more and more would come and then would get bubbled out. The little silkie was a real trouper and let the owners and vet do whatever they wanted. He did have a happy ending. The owner felt especially guilty because he was so fluffy, she hadn't noticed what was going on till it was very serious.
Maggots do eat live flesh, when they run out of rotten flesh, and they can migrate through the body and reach the brain. This is what I learned and remembered from that thread on BYC years ago.
I hate worms and maggots especially - who doesn't? But I would have done the same with the silkie. I would imagine the vet had given antibiotics, I don't remember that part.