Oh, and this wasn't on the video, but after this filming, I propped the doll back up, looked around the room to take note of everything, turned out the light, left. I came in the morning to start work and turned on the light and went to my desk to turn on the power strip and then saw the doll again--same position face down! I made an extra effort last night to put the doll back so her heavy head was back and the face could not want to fall forward.
No explanations, yet.