I read that. Kara seems to be saying that she and the boyfriend have a plan, which they will carry out if this friend tells their parents they are having sex.
I hate reading these kids' blogs. They are so crude and disrespectful towards the parents who have given them everything--including the computers, cellphones, and blackberry devices that keep them in constant contact with those who are bad influences.
Parents have to wake up.
I followed your link and read the conversation between Kara and her friend. What a secretive DRAMA they had going on. If only her parents had read this months ago, they might have taken action and would be alive today. Personally, I would have considered moving this girl away as far as possible, maybe to a relative in a distant state.