Okay, so I don't know much about miscarriages in rabbits. But I had a doe that nested and pulled her fur and did everything a pregnant rabbit does, but she never had any babies. I bred her a second time and she had 9. If she doesn't have any breed her again and see what happens
She could be having a false pregnancy however some rabbits will pull fur earlier than others doe Just wait for the due dates to pass and see what happens