… starts killing off her friends. At the end of the movie her and one of her friend have survived the car crash and the rest died. The whole movie was basically a hallucination

I saw it approximately 12 years ago and it was in color. It was in English. It was a movie my parents and I watched together and it has been driving me crazy. One of the friends was mute but could talk during the hallucination. I think the ghostly figure had a green hue and looked sort of like a shimmer around him like heat rising from a fire.