You could make a separate place for her. Either a room by its self or an an area partitioned off from the rest of the coop. With both give her enough room she can get up and has to walk to get food and water. If she only has the one option for the nest she should settle on the nest. She may not but that is the chance you take moving a broody. If you try moving her again move the nesting materials with the eggs. In the dark the familiar smell should help settle her.
