Adam
Im not really sure why you ask anyone to explain how shiela did it. It would all be assumption wouldnt it as shes not here to tell us.
i will say this though and that is that she could have very well shot the whole of her family during one of her episodes. She was a seriously ill person and during one of these episodes could have overpowered neville with ease.
this poor girl had spent months in hospital, i believe she could be violent too, as ermani (sorry if i have his name wrong) said.
she just lost it, went and shot her children then went and shot her mum and dad. Her dad was shot but he was able to call jeremy, she came into the kitchen and she killed him.
She could have re loaded after she had shot her children.
Oh i know you would like me to into arguing all the points raised against this theory but why can it not be as simple as this.
julie lied, the blood evidence is rubbish. The family wanted the money and land and businesses
there you go! Got to go now cos im off out .