I agree, it’s very important to spay female rabbits for both behavioural and health reasons. It eliminates the possibility of uterine cancer, improves litter habits, gets rid of aggression, and makes it possible for her to have a bonded friend. The only negative is that it’s an invasive operation, but with a rabbit experienced vet, the risks are minimal.
While this forum doesn’t allow discussion of intentional breeding, I think you should consider what you would do with her babies if she did have a litter. Rabbits can have ten or more babies in one litter. You would need to find good homes for them all (personally, I don’t think I could ever find more than a couple of homes that I would think were good enough). Or if you kept them, you would need to get them all spayed and neutered so they could live together. Often first litters have high mortality rates as well, as the mother doesn’t know how to look after them properly. I see a lot of negatives in breeding, and not many positives, other than the obvious cute babies. It’s a very big responsibility.