Imo I don't think it was planned , her reaction afterwards does not seemed planned , inside editon showed footage someone shoot after the lights went out and the camera stopped shooting, and they were leaving the stage, and Janet looked absoutly humilated , you could see Justin trying to calm her down and sercurity guard had to calm her down and escort her off the stage. and that was before the media even gave there two cents , and the audience wasn't booing either, so I don't think Janet was waiting around for media approval.
and that's the part why everybody says Justin threw under her the bus not because he apologized ( and I don't even think Justin realizes this why people were saying that) , the fact is he gave a interview right after it happend happy and all gidy ,it was a worbrobe malfuction, and we love giving something to talk about . than a another interview a couple days before the grammys after all the media scrunity his tune changed a complete 180 , than it was I had nothing to do with , didn't know it happened, my mom was watching, I was horrified by it, and he clearly made it seemed exactly like Janet planned the whole thing and he didn't know nothing about it and like he was set up. I don't know if he did that because Janet apologized , but either way they should of talked to each other but Justin should of realized that it wasn't planned by her reaction alone.