She was depressed so she killed her kids
Maybe out of crack rock or some other drug. Why not just kill herself ? The drugs ate into her brain like a bad worm so she went on a murder spree. Only good news in this whole thing is the mother is dead the rest is tragedy
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Maranatha 
Mat 7:14 Because strait is the gate, and narrow is the way, which leadeth unto life, and few there be that find it.