I've been struggling with this story all week. On one hand, it's obviously very tragic for the family that their daughter/sister died because of their decision. I'm sure they are heartbroken; they didn't mean for her to die. On the other, she died directly because of their choice. And on the legal side, you have to weigh the whole "Freedom of Religion" that basically says that you are not only allowed to practice what you believe, but even if the rest of us think what you're doing is stupid you can still believe/practice it. With the exception of abuse, parents have really been traditionally given autonomy to raise their children the way they want to, and to believe whatever they want them to believe.
Where these people live there is an exception for seeking medical treatment if religious beliefs prohibit one from doing so. They believed she died because of their "lack of faith", so obviously not entrusting God to heal her Himself and taking her to the doctor would be a eggregious sin in thier eyes. Yeah, sounds like a bad thing to me but I'm sure some of the things I believe sound like a bad thing to them.