Maybe Arwen died of age. Aragorn was 90 when they got married, and he reigned 120 years. That's a long time for most Men, except for the Dunedain. But it never said that Arwen was counted among the Dunedain.
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Then Felagund upon the head
of Arothir set it: "Nephew mine,
till I return this crown is thine."
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