I had a lot of rabbits growing up. We had one that snuck over to the neighbors a few times and turned up pregnant 4 times. She was not always a great Mom. They will sometimes feed their babies, but that's about it. Her first litter was 13. She piled 4 large dead ones together and then had the rest all over the garage. It was like a crime scene. We put the 9 remaining in a box and hoped for the best. She actually fed those. You never really saw her taking care of them. Then she proceeded to have three more litters in succession. I believe their gestation is under a month and she just kept getting pregnant. She would not take cae of her other babies and they all died.
The point of this story is, that most rabbits do not make the best Moms. I am a big proponent of spaying and neutering rabbits because they well, act like rabbits and breed like crazy. It is not really explainable, but I have seen hamsters do exactly what your rabbit did. Please spay your rabbit if you keep her. There are plenty of unwanted rabbits at shelters.