Firiel wrote:
From what I understand, it's because she's actually half-Elven and she has one chance to choose between a mortal and immortal life. She chose a mortal life and she couldn't go back on that.
Now if I'm completely off, someone please correct me!
I think you're correct on that Firiel.
Arwen stayed because of her love for Aragorn and because of her lineage (being half-elven) she could choose to become mortal. And after that she couldn't sail to the Undying Lands.
Yah, I think you're right. Even after Aragorn died, I don't think she could because of her choice.