Why did Sheila not kill June but shoot Nevill 8 times and brutally hit him?
Why would June move the rifle off Sheila after she had committed suicide?
Was June planning to shoot the police when they entered? A shot gun is a lethal weapon.
Now your getting silly.
It is a big house, maybe she was able to avoid her or by locking herself in a room for safety. Read my take on the box room. You can find it using the search facility. Maybe she was shot a few times anyway. We cannot know. Maybe she was able to evade her because SC ran out of Ammunition.
I do not know she may have been being ultra defensive because of pain or shock. She may have shouldered a weapon ready to shoot when she heard voices. We cannot know.