I believe the truth will come out in the end, and I'm sorry to say that my intuition leans toward Kara being implicated at this point. Oh well.
What a tragedy.
Sadly, it sounds from her posts almost like she may have been pregnant . . . "the risk" she and David took the first night he came over . . .
This friend, and others, seemed to be trying to warn Kara off of what they could see was a bad situation. That, at least, gives me hope: that there were some fellow teens who had good sense and good judgment and spoke up, at least to Kara.
The teen-age oath of loyalty, though, can be so destructive: if one of the friends who was concerned had talked to parents MAYBE this tragedy could have been avoided.