It was 2am.
Everyone else was in bed when shot.
She would have been asleep.
The level of Haloperiodal she was on, had sedative effects.
She was behind a closed door.
Bamber's upstairs shots with silencer would have been impossible to hear. Even if awake.
Impossible for Bamber's upstairs shots with silencer to wake Sheila.
The twins & June were shot & killed/negated while they slept.
Nevill ran straight downstairs, bare footed which would have been quieter.
The kitchen fight was downstairs.
Nevill, June, Daniel & Nicholas did not have the opportunity to wake Sheila.
She had no injuries suggesting she had been in a struggle.
If she had woken & got up, Bamber would have shot her where he found her.
There was no blood on Sheila's feet or hands suggesting she had walked up to June.
If she had woken & decided to walk around WHF, she would have put on footwear or a dressing gown. Or both.
If the kitchen fight had woken her & motivated her enough to get up, she would have gone to where the noise was - downstairs.
Bamber had no injuries although unlikely an awake Sheila could inflict any.
If awake & aware what was happening, she would have stayed in the twins bedroom. And been shot there.
There is no upstairs upturned bedroom furniture suggesting a struggle with an awake Sheila.
Bamber's first shot was in the perfect location suggesting zero resistance.
If she did wake in bed during the kitchen fight, there is no guarantee she would get out of bed. She would have just heard feint downstairs noises.
It may have been impossible tl hear the kitchen fight from Sheila's location.
Julie's WS says Bamber told her Sheila was shot last. This would not be the case if she was resisting half way through.