I think Marie suggested that you can cover windows with heavy curtains so that the moonlight doesn't hit her at night. Once you cover the windows, it seems that you can put her bed there, as long as she has a solid headboard for support.
The first priority is to sleep in a good personal direction. The second is to not be in the direct flow of the door. This eliminates the SE. The third is to be able to see the door.
Also, when she feels sick, she should sleep diagonally, with her head toward the NW.
