The phenomena of people going missing immediately after a crash needs to be researched more imo. Having saids that, has it been explored whether she travelled anywhere after Washington? Maybe Canada? If so, there are a couple of possible cases that may be worth looking into further.
The timing fits the Jane Doe
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Probably too far away
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Again, probably too far
www.services.rcmp-grc.gc.ca
The timing fits the Jane Doe