Nothing she could have done is reason for her to be harmed in any way. Have to wonder though, if such a "perfect" person, possibly had some stress issues maintaining that image.
Read somewhere on these threads that she and her family were well traveled. So that makes me think this probably wasn't her first encounter with lifestyles outside Birmingham.
Have you ever wondered why Natalees smile looks exactly the same in every picture that has been taken of her, and there have been hundreds, apparently? An nice smile, but with a hint of sadness. But every one identical to the last. I've wondered about that smile a lot from the first.