Manlove's evidence suggests she was already dead when the cheek shot was made.
SHOOT: If Laniet was already dead (having been shot in the head/brain) why on earth would the killer lower the rifle and shoot her in the cheek. It's far more likely that he first shot her in the cheek.
It's also strange that Robin Bain was found only with his own blood on his clothes and no fingerprints on the rifle. David Bain's fingerprints are on the rifle, his socks and clothes covered in blood of various family members. Case closed!