It IS evident that Sheila wasn't wearing the nightdress while shooting 25 shots. Either she didn't do the shooting or she put on the nightdress before killing herself. Either way, no matter who pulled the trigger, there must have been some GSR on the nightdress. It is easily transferred by handshake or handling the weapon or just being in the vicinity of a fired weapon. Do you have documentation of the test?
Backspatter is still just a theory. To prove a theory exhaustive tests must be done replicating the situation. Since that can never happen [unless you can find a few guinea pigs willing to be shot in the neck] it will always remain a theory. I have postulated other theories that would result in the same outcome.
If A+B=C,and D+E=C and F+G=C,
Just because we know the result is C then we cannot say it is a fact that A+B was the cause.
Scipio, Your comparison between learning to load a rifle and learning Chinese shows that to you loading a rifle is rocket science or that you think learning a foreign language is something that can be done in 5 minutes.
How you know there was no blood, other than menstrual, on the panties means either you were there or you are psychic. Anyway, she could have been stark naked for all we know.
There was blood on the screw thread.
You should stop trying to make sense of Sheila's actions. She was delusional, therefor, things that made sense to her would be obviously irrational to us.