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...is ultimately what matters to the LW (who has my sympathy). And, too, it may symbolize the last straw, the one that tipped over her grief. Sometimes the seemingly (to some) insignificant do that to us. And who are you, Paul, to judge her for that pain, regardless of its trigger or source? Each of us deals with pain and loss in our own way.
Perhaps if she can find the cabinet, but can't salvage the wood, she can salvage the door pulls or some other component of it around which to build a new cabinet.