The only way, that WPC julia Jeapes could have seen the front door to whf, was if she was stood in the position depicted in diagram PIG3, from where she could have also observed the rifle leaning up against the bedroom window...
More importantly...
She relieved PC's Alexandra-smart, Collins and Delgado, from that location, who then made their way to enter the door, having to pass the main kitchen window en route to the door, and beyond the door to the other window which was known as the back kitchen, and PC Collins peered through and reported seeing the body of a dead female behind the door - this body could not have been the body of Ralph Bamber which was mistakenly identified as that of a dead female (but it was the body of Ralph Bamber), because Ralph Bambers body was not found in that room...