Can you give a little more information? Is the doe doing it in the nestbox or while the kits are out and about? What breed?
We never had a big problem with this. I had a Himalayan that was very stressed out and was stepping on the kits. We also had a Brit who abandoned her kits and then kept running over them...obviously not a good mom (and got rid of her). At 4 weeks your kits aren’t newborns anymore...if it looks like your doe is doing it intentionally or doesn’t seem to care that she’s doing it, you probably shouldn’t breed her again.