An Arwen Discrepancy

This may be a bit off subject, but I always thought that (like most of you) she would have retained all of her physical attributes, but since she was so advanced in age, it wouldn't take her long in "human" years to pass away. As for her giving up her birthright, I always assumed that her pendant was symbolic of her immortality - hence the reason she passed it to Frodo which allowed him to join the rest of the elves as they crossed the waters - and that this was a choice entirely for her to make. Remember, Tolkien's writing is always laced with religion... the elves were most likely his vision of an untainted human, and their choice of immortality was probably much like free will. Just a thought.