I'm befuddled by this. Why would anyone deliberately shoot a 9yo? It does seem as if the mother was aware that she had been killed (via the text messages re sand and the boat). From what I have read, she had never met JS previously as he had only been released from jail a matter of months? I asked this question before, but I don't think anyone here knows when CM arrived for her visit? According to KM's FB page, she was supposed to arrive on 21 December, but the media have said she was on a 2 week holiday. That would mean she had to have been killed before 4 January, and that doesn't seem to have been the case.
The only thing I can think of is that CM saw/witnessed something that they were afraid she would blab about and put both of them back into jail. I guess taking drugs or dealing drugs would be the most likely given their history. CM was described as "chatty", and the description of JS being strangely silent on the ferry ride might indicate that she had let something slip that she should not have, or it just struck him that she couldn't be trusted to keep her mouth shut.
The only thing I can think of is that CM saw/witnessed something that they were afraid she would blab about and put both of them back into jail. I guess taking drugs or dealing drugs would be the most likely given their history. CM was described as "chatty", and the description of JS being strangely silent on the ferry ride might indicate that she had let something slip that she should not have, or it just struck him that she couldn't be trusted to keep her mouth shut.