Well, I didn’t get to exercise the Ball much in the last NaNo thread, so let me see what shakes out for this. (Note, this is unlikely to be anything like what Jackson had in mind, it’s just a Bad Plot I might use if handed these scraps and had to run with them.)
The things the widow saw as a child, plus whatever real mediumistic abilities she may seem to have, are alternate outcomes, alternate worlds. “Ghosts” of what might have been. Her husband wasn’t much before he died, and now he’s even less, but he could have been more, or she could have married someone else. Frustrated by the wasted potential of her life, she’s chasing those ghosts, trying to find a way into a world where her life is not so empty–one with a still-living version of her husband she could be happy with, perhaps. Or just a more exciting one.
She’s reviewing choices she and others made in life, and trying to change her life to “correct” them. She moved to a city she believes she would have ended up in, had she made a different choice somewhere along the line. She tries to steal seemingly random objects because her visions suggest that she would have had those things in the life she’s trying to reach.
Eventually–preferably about when the reader will conclude she’s just crazy–she will succeed. She’ll manage to walk through just the right place at precisely the time her alternate self would have, wearing and carrying the same items, and take a sudden turn into her new/old life. She finds her husband alive, and better in many ways. She has grown children, and a grandchild on the way (hence the birth announcements). It may not be a perfect life, but it’s about the best she could have hoped for.
From there, the possibilities diverge, depending on what sort of story it is. It can’t stay where it is, of course–too upbeat for Jackson, I’d say.
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Scene ends with her holding her grandchild. Next scene has the landlady finding her dead in her room, smiling.
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She and her “new” husband are killed together in an accident of some sort. (She could only see that the alternate present was better than hers, not what its future held.)
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She didn’t just step into an alternate world, she traded places with her alternate self, who is now trapped in the “real” timeline…and understands what has happened. She knows she has no real chance of switching back, so instead she starts making adjustments that push the widow’s stolen life farther from reality. It starts to unravel, pieces of her past simply disappearing, leaving her more alone than ever. Eventually, she disappears herself.
Final scene is of the man who might have been her husband. He’s in a reverie, putting the last few brushstrokes on a portrait of a middle-aged woman. It’s not a very good portrait, but he smiles at it anyway. It’s not that bad, for a portrait done with no model.