[Inziladun]

Well, I don't see how Arwen can be seen as "having succumbed to the sin of clinging to mortal life rather than accepting mortality and trusting that there is life after death."

She refused to continue with life because she found no further joy in it after Aragorn's death. Contrast that to the Númenóreans, who resisted mortality due to the bliss they did feel, and a desire to not lose it.

Arwen's fate is rather comparable to that Rían, Tuor's mother, who lay down and died on the Haudh-en-Ndengin out of grief; to Melian, who exercised her angelic freedom to return to Aman after the death of Thingol, again out of grief; or Arwen's own mother, Celebrían, who left Middle-earth after being wounded by Orcs.