Because we now know that Sheila was the last person to die inside WHF,,why didn't she summon help much sooner if she herself knew that she wasn't going to be mowed down imminently.? Sheila had ample time to ring up the services.. If Jeremy had committed the crime,,they'd have all been wiped out in one fell swoop together,,,exactly where they lay-------------in bed..
Not in this case where one person was still obviously wandering around.
Sheila at least could/should have thought about her children. There were plenty of hiding places within the farmhouse where she could have kept the children safe until help arrived.
I don't believe for one minute that the children didn't wake up. I've read that they were both on the landing at one point,,then were taken to bed,,probably told to close their eyes and that was it.
The dog yapping,Sheila screeching,the rifle going off,would have wakened the dead.
Anyone going into the farmhouse with the intention of murder would first have got rid of the dog,,I don't care what anyone says,,and anyone wakened at that hour with the dog barking,would have rang for help. You would yourself.