A C-section is an option, but is more of a last resort. It can be expensive as well, especially if it is an emergency. I am not sure what the chances of the kits surviving are, unless you had another nursing doe with very young kits that could foster. With dogs, puppies can be easily bottle fed while the mom recovers, but rabbits are much harder to hand raise. Usually a C-section is done if the doe is having trouble and not able to deliver on her own, this might be a few days past her due date and the kits can be dead already.
How big is the male compared to the female? If he is much bigger, the kits could be too big for her to pass on her own. You generally want the buck to be the same size or smaller than the doe. Larger breeds can get away with more of a difference than smaller breeds (1 pound when you weight 20 is not a huge difference, but 1 pound when you weight 3 is a lot).
You might want to get her to loose a bit of weight so she is in better condition before breeding her. Usually about a month of a bit less food and more exercise and help a lot.
If you are worried and have doubts about breeding her, don't do it. There is the risk that she could die (it is always a risk) and if you are not willing to loose her, don't breed her.