When mine do this:
I wait a little while after nightfall and I will move her and her eggs in a big dog crate (really any size as long as she has some room, I just have a large one I like to use) and put her in the coop or run if your coop isn't big enough. Put enough pine shavings in it so she can make her nest in it. Some hens don' like to be moves in the beginning of their bloody adventure so she may protest or not do it at all. I like to test by putting one egg in first then her and if she accepts the move, then put all the rest of the eggs under her. It may take a few times for her to know that your are trying to help. I had to do it two nights in a row twice each night until one of one would finally just sit on them in the box. My hens are now used to being moved they just accept the change lol