I think this may be a case of a story being made up and expanded step by step to make fit the theory that a soundly sleeping Sheila was lifted from her bed and carried, unwaking and unprotesting to her death.
There are lots of theories.
The recent video had Sheila being lead. Without protesting.
Wilkes's book said David Boutflour believed Bamber woke Sheila and persuaded her to go into the main bedroom because 'mummy' wants to pray with her.
Scipio believes she was woken and lead at gun point.
With everyone dead, Bamber also had the option of carrying her.
I've forgotten what CAL's book says.