Why did Arwen go to find the hobbits?

[tar-ancalime]

Voralphion said:

Even if Elrond knew that the hobbits were coming despite not being told so, why would Arwen be sent. She was the daughter of Elrond, (the lady of Rivendell) so why would her safety be risked especially when the Nazgul were near when there would have been plenty of others better suited to finding them and going against the Nazgul, such as warriors like Glorfindel.

Well, if (and this is a big if) Agent Elrond and Book Elrond are indeed the same person, this is not really a problem. After all, Elrond's sons were always going off on scavenger hunts, camping trips, and other larks. Movie Arwen is every bit as tough as her brothers, Nonexistent Movie Elladan and Nonexistent Movie Elrohir, and we know that she can hurl epithets across rivers with the best of them.