lonely socially awkward woman has baby to connect but kills herself and him when she feels she is…

…loosing his attention

late 90s or early 200os indie film in which a lonely, socially inept woman awkwardly gets herself pregnant because she desperately wants a baby but has no real relationships. When she has the baby she feels connected and semi-happy for a while but then when he gets old enough to start school, he is less interested in her and she feels she is loosing him. In the tragic final scene she tells him they are going for a drive and she asphyxiates them both in the car. The mother was middle aged and blondish.

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