It is all a question of timing and sequence...
At 7.37hrs, Sheila is clearly the female, described as being dead downstairs in the main kitchen, along with Ralph Bamber. His death is described as a murder, and Sheila's demise described as a suicide. Her body was not upstairs by 8.10hrs, but it ended up there on the bed by 8.30hrs. Her body was still on the bed when Craig and Miller viewed her body there at 8.44hrs. After this came a stream of independant witnesses, PS Adams, PC Wright, DS Jones and DC Clark, all giving a similar account. By 10.00hrs, SOCO took control of the farmhouse, and PC Bird started to take photographs - 8 such photographs were taken around the time that Sheila's body which was on the bed with only a single gunshot to her neck, ended up on the bedroom floor with two gunshots to her neck...