I remember in your other post you said she was only 12 weeks. Is that right? If so, don’t get discouraged. It’s normal for babies to be much more messy and take longer to train than adults. Also, as Jewel mentioned, it WILL make it easier if you decide to spay. Plus, its healthier because female rabbits have a very high percentage of cancer in their reproductive organs.
So even though she may be a little bit more messy until you get her spayed, it’s still good to train her. Reason being is that unaltered bunnies may learn to be littertrained, but their need to also mark outside of the box is still strong because of their hormones. When they are neutered, and their hormones die down, the need to mark outside of the box is lessoned, but the habit of pooping and peeing (not marking) inside of the box may already be ingrained because of previous training. So all your hard work wouldn’t be for nothin’. Make sense?