Afterall she was even MORE to blame for her death as she was the one who was driving the car in the first place! AND she also didn't go back to the body, she was just as guilty as her BF, yet the ghost is after Tun. I found this weird. It wouldve been so much better if the ghost had tried to kill em both.
Did you actually watch the movie? It sounds like you were watching from behind a pillow or something.
First of all, she didn't die in the car accident. It was "ghost Natre" who stood in the middle of the road. She died years earlier from an overdose and that's why she's already rotten and all when they visit her mom's house. So, the ghost isn't after Jane because Jane hasn't done anything wrong. There was no car accident nor was she involved in the rape of Natre. Tun on the other hand was involved in the rape by taking pictures.
What I do agree with is that it might have made sense for the ghost to scare Jane away because that would leave Tun and Natre-ghost "together". Right now it's kinda odd that Tun and Jane might be having sex when at the same time Tun has Natre on his back.
I think he should pray to Natre and make some kind of a deal. Leave him alone in this life and in the afterlife he'll get back to her, or something like that.
She commited suicide, Jane didnt really hit her. If anything Natre was warning Jane that he was not to be trusted or relied on. Hence she only scared Jane but did no physical harm to her.