You have a very determined nester! Is there a way you can giver her a smaller room or space of her own while she has babies? I'm not sure she'll give them the full attention they need if she's free roam. I'd advise moving her to an exercise pen like enclosure. Then, take a basket/bucket/container that's just large enough for her, but not huge, and fill it with hay. Place the fur she pulled on top(not the rest of the materials she used, just fur). give her some extra hay scattered around so she can nest some more. The fur in the nest box should give her an idea of where to make her nest. Keep her in the pen for the night. Bunnies generally give birth in the earliest hours of the morning, but some of mine have had their babies at 5 in the afternoon or around then, so I'd probably shut her up then. The next day, if she has babies, keep her in there for the morning time. You can let her free roam for a few hours during the day, but put her back in there in the evening. After a couple weeks of this routine she should remember to feed her babies at those times.
@Moonshadow is very correct. Other materials in the nest box(especially insulation) can sometimes harm the kits. I like to let my does have only hay in the summer, and sometimes Carefresh paper shreds in the winter for extra warmth. I'd go with just hay for now, because as a first time mama she'll find that the easiest to nest with and keep clean.