Collars are a huge no no for rabbits. Far too much risk for them to get caught on something and choke the rabbit. Even a paw can get stuck which could make the rabbit freak out and could become seriously injured. Since most rabbits don't wander like a cat or go out like a dog, a collar with ID is not really needed.
You can get a harness (H style preferred) and put the tag on that but only have it on when you are outside or training.
You can get her tattooed as another permanent ID. You can do just about anything as long as it fits in the ear. Even getting something like Chipped could tell people to check for a microchip. Vets should be able to do this, but breeders will also do it and it would be cheaper.