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Nah it actually doesn't make a whole lot of sense. Basically I see it as:
Her motivation is that she is bat-shit insane. Alex was not her friend. Alex and her family had never seen her before that night. The initial car ride and meeting the family was all in Marie's head. The first time Marie entered the house was when she killed the father. I think she really was sitting on the swing, smoking and watching Alex in the shower. She then "masturbates" (in her head) and her climax coincides with the killer (her) showing up at the front door.
Basically I love the movie except for this. It seems like they felt they needed some sort of "twist" like most horror/thrillers do these days when this movie would have been perfect without it. But to me, the rest of the movie makes up for this mistake.
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