Behind the right end of the sofa is a likely place to hide, because it is next to the only light left on, when the parents went out for a meal.
However, what if a burglar opened the child bedroom shutter and window, child ran away from that into lounge, and heard the chat just beneath the lounge window, and tried to signal for help?
If the settee was away from the window, the child would have been able to stand behind it, partly open the curtains but then discover that the shutters were down. (
http://www.mccannpjfiles.co.uk/P9/09_VOLUME_IXa_Page_2309.jpg Foto 7 PJ forensics 4th May)
If the settee was very close to the window, as per the PJ crime scene photo taken that night, the child would have had to visibly disturb the curtains before accessing the window, only to discover the shutters down. In those circumstances, there was insufficient room for her to topple over & down the back. There were also no forensics to indicate blood or tissue loss relating to the child at that precise location.