As has been said, this isn't like she went off for a date, or even an overnight trip. Two weeks. One 15-y-o girl totally responsible for the care and feeding of those children. Meals, bathtime, washing clothes, cleaning up, getting off to school, emergency medical care, on and on. Not to mention the dangers she left them open to.
That just isn't right, and if I had lived next door to this crap, I would have called it in, too.
The above statement appears contradictory. The children were "RIPPED FROM..." (indicates an involuntary action) the loving(?) arms of a mother who VOLUNTARILY zipped off? There was no ripping; it was clearly 100% voluntary (I may be misinterpreting your comment, though).