Wilkes:
'According to Freddie Emami, Sheila had lost all muscle coordination in her last weeks. If she wanted to drink a glass of water, she would need to use both hands & her movements in bringing the glass of water to her mouth would be very erratic. If she wanted to put out her left arm, her right arm moved out involuntarily to balance it'.
--------
This simulraneously means Sheila was a lamb to the slaughter & unable to shoot anyone.