Something comes into my mind in regards to Ruby's plan to move away to some desert land:
From other child abuse cases I learnt that the kids are killed or starved to death when the parent can't call a doctor anymore without releasing long-term neglect or risking that the tortured child speaks to the doctor what was done to it (which would put the parent in prison).
Is it possible that this was the reason she dropped them from school/didn't allow contact with the father etc.? This would mean she knew perfectly well, in what state these kids were. It was reported that some wounds were black and smelt. This is very dangerous, often this results in amputation or blood poisoning/sepsis. Only a professional doctor can treat this kind of injury and it must be done quickly. Maybe she knew this and she realised that there was no way out for her. And then decided to kill them.
From other child abuse cases I learnt that the kids are killed or starved to death when the parent can't call a doctor anymore without releasing long-term neglect or risking that the tortured child speaks to the doctor what was done to it (which would put the parent in prison).
Is it possible that this was the reason she dropped them from school/didn't allow contact with the father etc.? This would mean she knew perfectly well, in what state these kids were. It was reported that some wounds were black and smelt. This is very dangerous, often this results in amputation or blood poisoning/sepsis. Only a professional doctor can treat this kind of injury and it must be done quickly. Maybe she knew this and she realised that there was no way out for her. And then decided to kill them.