If you keep them together, there is a chance that the male could injure or even kill the babies when they are born. Is that a risk you want to take?
Also, female rabbits can get pregnant again immediately after giving birth. If you keep the male with her, and she does have babies, the chance is high that you will end up with more than just one litter because the male will most likely get her pregnant again right after she gives birth to the first litter.
She deserves to be a mom? What about all the rabbits who get euthanized in shelters because there aren't enough people adopting them? Don't they deserve to live and have loving homes? Instead of selling or giving away the baby bunnies that you make, you can encourage people to adopt or rescue like you did for the two you have.
Your rabbit won't care if she never has any babies. She'll be perfectly happy and content without having a litter. In fact, breeding can be risky business. I hope you have a lot of money saved up in case you have to take the mother or the babies to the vet. Having babies is very stressful on a females body and there can be complications.
I'm not against responsible breeding. However, breeding two rescue bunnies that you don't know the history of because you think the rabbit "deserves to be a mum" is not responsible breeding to me. Enjoy your rabbits as pets, and leave the breeding to the experts. Seriously, your female rabbit won't be upset or even care if she's not allowed to have babies.