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I think it's all Diane's dream 'til the "time to wake up little girl" line. In reality she's been the jealous understudy and lover of a genuine star and feels jilted and bitter when said star announces her intention to marry her director. Diane arranges her murder by a couple of hit men then falls into a guilty sleep and dreams a fantasy rationalization which is our perspective in the film.
That's my take, which could be entirely wrong, but only David Lynch knows for sure.
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