If there is a way at all, then put her in the West. It doesn't matter if there are windows so long as they are covered by curtains at night and there is a headboard. If the ventilation will be obstructed, though, then you have little choice but to use the S. If you do this, watch for poison arrows coming from the walk-in closet. Have her sleep at an angle in the bed along the NE-SW axis (being careful that the bed is positioned such that her feet don't point out the door). You may also have geopathic stress on the exact point where her bed is, so moving it to a different wall may in itself be enough to solve the problem.
