Police had to get into the main kitchen to discover the body of Ralph Bamber before they discovered the body of a dead female, and therefore, female body had to have been found in the area of the main kitchen beyond the find of Ralph Bamber. The female body could only have been Sheila, no-one else, and from the vantage point of being outside the kitchen window and looking into the main kitchen, the only view of a body behind a door could have been a female body beyond the pantry/scullery/laundry door, as shown in the attached diagrams...
Male body (Ralph) was found in main kitchen, and female body (Sheila) was originally found beyond the door of the scullery room attached to the kitchen, and this was why PC Bird (SOC) took photogrhs in the order he describes...
(1) - kitchen
(2) - laundry room attached to kitchen
(3) - main bedroom upstairs