Um, I know that you've sort of gotten away from the Arwen/Luthien comparison, but anyway.
Tolkien states somewhere (I think) that Luthien was the only elf whose fëa actually left the world. That was because she actually went directly to Mandos to make him give her back Beren and traded her immortality for another chance for Beren. Arwen wasn't mortal per say, she died in a similar fashion to Miriel, only of grief, rather than weariness.
And if this is completely off, just ignore me.
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