Please someone clear something up for me (SPOILERS)

Two things bothered me with this movie---

First--we find out that Jane never hit a girl in the middle of the road. That was the girl's ghost trying to warn her about Ben. And since Ben and Jane find the decomposing body of the ghost later in the movie, we know she has been dead for a long time.

We also know that the "ghost" has appeared in photos before they even left for Tokoyo--it appeared in some of their wedding photos and it appeared in the photos Ben took when they were having sex just after the wedding (all while still in the United States).

From Ben and Jane's reaction to the affected photos, we can assume this is something new to them--it hasn't happened before.

Also, we can assume that the pain in Ben's neck is something new as well. Jane comments on it being a result of the accident, and Ben even goes to the doctor's for it while in Tokoyo.

Yet we are also led to believe that the ghost has been with Ben for a while, since her death. The reason I believe we are to think this is that the ghost had been with Ben since before getting to Tokoyo. So it's not as if it "latched onto him" as soon as he got to Japan. It was with him before that.

So, assuming all of the above, why did the pain in the neck and the affected photos begin only recently if the ghost has been with Ben for so long?

The second thing that bothered me--and maybe this was resolved, but I just missed it--is how did the girl end up dying. In another post on here, someone said it was suicide because of the bottles of poison found in the room. Yet two things made me think that Ben had killed her: (1) his reaction of disbelief when Bruno said he saw the girl not too long ago, and (2) the scene where he sees the ghost in his film room and then has blood on his hands and face.

From those two scenes, I thought we were going to find our that Ben killed her. Yet, at least that I remember, it's never mentioned.

All in all, it was an ok film. It did have a couple of parts that made me jump. I didn't see the part coming where the ghost was "on his back" the whole time. That was cool. But I wouldn't say I need to see the movie again.

I would appreciate any comments anyone might have on either of my two points.

thanks.