When the first title images appear after the car crash with the music all I can think of is David Lynch. Then the creepy music over bland day to day activity. Lynch.
The weaknesses in the movie are that I didn't find it particualry scary and the horror unfolds in a predictable linear path of increasing the horror visually until a saturation point. Maybe it's dated but so it should be. But the weaknesses do reveal strengths as everything you do feel isn't because of an effect, shock or plot twist (accept the very end) but by pure film making. How many film makers today are this brave?
The movie is easily a better psychological character journey than a lot of modern horrors. It really succeeds in atmosphere too. Its not an overpowering atmosphere nor a pretensious one, but the organ sound and visual combinations never become unaffective in portraying a darkness and paranoia. It makes you want to get out an organ yourself and play some dark random chords and think of images. It's inspirational. The movie is like a lesson in no frills horror. Only a 6 because I just didn't feel like I needed collect this movie and it was too predictable for me to fully enjoy. I'm sure many will like it more than myself.
At the end of the movie I concluded she did in fact die in the crash but emerged an unaware lost soul. She was eventually guided to her death to escape her torture.