The foot was the distance between the shooter and victim.
So June is a mere foot away from Sheila who manages to shoot her accurately between the eyes. This means that EITHER June has to make her way back along the side and bottom of a double bed, move passed the bed until she collapses against the door, OR Sheila, with a shattered spine is not only standing, but able to lift the gun to aim it at June who's managed to get to the door. Sheila then turns round, takes herself to the other side of the bed where she positions herself for the final shot. Perhaps you could tell us how you see it panning out?