User blog comment:Jkphantom9/Shane Newville: "An Open Letter to All Who Treasured Monty Oum"/@comment-28189972-20160513021804/@comment-25936766-20160513224913

That's a reasonable way to justify Raven vs JNPR. If we assume she works for Salem for whatever reason, and saw how Pyrrha was likely to be chosen as candidate as you say, she could have attacked her, with JNR getting involved.

As for Pyrrha's original death plan...it says Jaune causes her death, but it doesn't say he kills her. Maybe he, being a noob, was going to get himself killed and Pyrrha sacrificed herself to save him.