Does a rabbit protect her den for the kittens?

Rabbits do not give live birth to kittens as they are not the same species.

Rabbits are mammals that belong to the order Lagomorpha, and have a different reproductive system than cats. Cats are mammals belonging to the order Carnivora, and kittens are the offspring of cats. Cats give birth to live kittens which they protect in their dens. Rabbits, on the other hand, give birth to live offspring called kits or leverets. Baby rabbits are born altricial, meaning they are underdeveloped and rely on their mothers for care and protection. Rabbit mothers prepare nests for their kits in burrows or sheltered areas, lining them with soft fur to keep the young warm and comfortable.