@Green Witch,
She's not an idiot. She's just 15. I know sometimes those two things seem to go together, but I don't think it's fair to throw that at her without know more about her life.
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Fair is it fair that she is playing with fire and might end up forcing her parents to spend another 18 years raising another child?
God how many lives is she now placing at risk to have a sexual/emotional relationship at 15 she is not ready for?
She is indeed a fool and to talk to her as if she is an adult who should be in such a relationship you are clearly not doing her one little favor.
Wonder how her parents would feel having an adult woman giving her relationship advice as if she was an adult?