If she didn't pluck fur now, and not gathering hay for the nest I would shut her in her cage right now and leave her alone when she starts plucking fur, just peek from a distance, not irritating her, just to be able to help if something goes wrong, like kits born outside the nest.
Before kindling they have an incredible urge to build tunnels, very stubbornly, that is ok, and not too late to put her in the cage.
If it's too late and she already built a proper nest I would not interfere, and not move the nest until a feeding routine is established, about 3 days. When transferring the nest stuff her nose into it several times, hours apart. Then keep her shut in her cage with the nestbox until she fed the kits, and lock her in there around feeding time the first days. When you let her out block the region where the nest was.
Moving the nest really is a big thing, rabbits don't care much about kits, but about the nest, and it's location defines whos nest it is. If they find their nest empty, it's gone. Accepting a nest in another location doesn't always work. Last time someone documented that here it ended bad for the kits.
.