Do you have a source she was sedated? I thought this was the only way JB could have shot Sheila when I watched the WHF series but the toxicological tests came back negative?
She was on Haloperidol.
The COA says she was sedated.
I see you are focusing on the most popular supposed flaw in my Bamber scenario. Rather than the 34 flaws in your Sheila scenario.
There is also the slim chance Sheila woke & went into the main bedroom while Bamber was downstairs. He then just had to lay her down & shoot her.