This particular story does not involve a child, it involves a 20-year old woman who was dealing with postpartum depression, but I think there are two important lessons to be learned from it, that do apply to children as well.
1. Victims of sexual abuse, and sex trafficking, come from all over, including well-to-do suburbs.
2. Traffickers, like pedophiles, seek out people who are already on the edge and vulnerable. They insert themselves into their life, seeing like a source of love and support, and then trap them with threats, especially threats to the family they left behind.
Keep an eye on the vulnerable people around you, kids and adults. Be a source of support. It might just be the thing that keeps them away from those who would look to take advantage of their vulnerability.