Again, I will repeat what I have just said. It bears repeating, because you are not keeping to the evidence.
There is no evidence that Sheila was sedated that evening.
There is no evidence that Sheila was docile that evening.
She may have been these things. I accept it is possible. But these things cannot be asserted as fact.
It may be that Important People With Lots Of Letters After Their Names mention the word 'sedation' here and there in official documents and that catches your eye. It still doesn't mean she was sedated.
The evidence is -
Bamber had no injuries.
Sheila had no injuries.
Sheila did not respond to fostering conversations. A few hours earlier.
Sheila spent 3 minutes just saying 'yes/no' on the phone. A few hours earlier.
June took the phone off Sheila. A few hours earlier.
Bamber rang Julie to say 'it's now or never' after monitoring Sheila.
Sheila was on Haloperidal which has many side effects. Sedative effects being one of them.
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Not sure what else can be supplied.