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.
I didn't read that in, but it may have been implied and I just missed it. It seem to me she was so under his spell and vise versa that they weren't going to take no for an answer, even if it meant drastic action.