
I do hope that you will have either her or the dog neutered before she comes in season again. Now that he has had her once it will be even harder to keep him from mating her, and in the average domestic situation keeping both sexes entire is too dificult as you have found (it is why I only keep bitches).
The bitch is likely to come in season again when her pups are about 4 months old. If you wanted her spayed you would need to get it done when they are about two months old, otherwise it will be too close to her next season. For preference I would have him castrated, and then have her spayed 3 months after her next season. As two months after whelping may be a bit soon, especially if she has had a C section.
If she does have a C section then if all is going smoothly she can be spayed at the same time.
I don't know if you are in the UK or USA but I would like to let you know that rearing these pups will cost a lot.
By the time pups are 10 weeks old they will each be eating about half as much again as an adult dog. So with an average litter of say 8 you will be having to find an extra 12 helpings of best quality food for the pups. With parents that will mean you will need 7 or 8 times the amount of Dog food you are using now, and as they and Mum will need a high quality (Puppy) food it will cost half as dear again as their ordinary rations.
That is just the food.
As other posters have said the best potential buyers for the pups are those who will have researched the breed and will want puppies from responsible breeders who do all the health checks and are there with knowledgeable back up for the rest of the pups life.
This unfortunately means that you are less likely to find such people to buy your pups. Please be very very careful to whom you let them go.
There is nothing more panic inducing than a litter of older pups eating you out of house and home, and no good homes in sight!
Did you not know that you could have taken your bitch to the vet after the accidental mating, and have any pregnancy stopped with an injection, or if you found later she was pregnant she could have been spayed?
I hope all goes well, and please continue to ask for advice, which will be freely offered, but don't be surprised at any critisism.