Why did Arwen go to find the hobbits?

[Lalaith]

But as Lush said, there is a school of thought (also attended by me) which holds that "all the other Aragorn & Arwen stuff they did" was pretty grim.
The ford scene, and yes, the bridge love scene, were about the only Arwen appearances I really liked. It all went downhill from there - Arwen dying over the Ring, and then the snog at the coronation, were two of the low-points of RotK for me. (Not that I've got a particular problem with snogging, you understand, it was the hugely unTolkienish public nature of it that I objected to.)
And as I've said before, there is a way of justifying Arwen at the ford, canon-wise: in the book, Frodo in extremis calls on Elbereth, and Luthien - and Arwen is, after all, held to be Luthien reborn. (I do also agree with another school of thought on this forum, that movie-Frodo could have been a bit more proactive in defying the Nine, but then I have an issue with Elijah's little-junkieboy-lost perfomance in general)
Legolas - the change from nine days to two might be to make it seem they were closer to Rivendell than they were in the book when Glorfindel found them?

[Nilturiel]

I don't understand why PJ changed so much things. Like this arwen/glorfindel thing and when frodo is traveling across the shire. Why coulden't it be like in the book? where frodo is traveling with sam and merry and where they are going to the house in buckland.
I think it was unnecessary of PJ to change all these stuff Tolkien put so much time writing.. Tolkien is probably turning in his grave..

its true pj definetly should have taken out the part with fatty bolger in buckland.

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[Meneltarmacil]

The absence of Gildor really wouldn't affect Elrond's sending a messenger to search for Frodo. Aragorn had already gone to wait for the hobbits at Bree, and had probably told Elrond when he'd have brought them to Rivendell. Upon learning that Aragorn had not arrived back on time and that the Nine were abroad, Elrond sent his messenger (in this case, Arwen) to search for Aragorn and the hobbits.

As far as how Elrond wouldn't know that the ringwraiths were searching for the hobbits while Aragorn did know about them, I would guess that in the movie Aragorn didn't find out about the ringwraiths until after he was on his way to Bree.

[alatar]

Been thinking about the Arwen at the Fords scene. What was PJ trying to accomplish? Methinks that he wanted to do two things: get more Liv into FotR, and show that Arwen wasn't going to be the damsel in distress nor the parting gift at the end of the quest. Arwen would be shown, and shown as being strong.

So we got the scenes that we got.

I think that PJ could have accomplished these two goals better (imagine that! ), but maybe he was constrained by wanting/needing a car chase scene early on in the movie. Sure, Arwen replaces Glorfindel, and I could deal with that, but when she becomes Frodo's taxi driver and savior, well...

We could still have included the car chase scene sans Arwen (where Arwen and Frodo Baggage flee from the Nine), but maybe as Frodo was mostly dead, the horse would have appeared more heroic than maybe was comfortable for some actors - and you always have to consider the Oscars, and just how *do* you cut a horse's 'thank you' speech short? The other issue is that it appears that Arwen and Frodo ride a good bit of the day, and so the distance for the other three hobbits to cover to be at the Fords concurrent with Frodo and the Nine was impossible - I mean, hey, they ain't natural sprinters nor long distance runners like Dwarves!

So, to put things aright, we would need to shorten the race to the Ford so that at least the Ranger and Arwen could appear at the Fords when Frodo resists the Nine - just like in the Book. So, as I see things, we'd have mostly dead Frodo ride from the Nine, and it would take a few moments for him to get to the Ford. After he crosses and the Nine begin to dip their hooves, Frodo could go through the whole "Go back" scene, which would help as we would never hear "She-elf." When the Nazgul are almost ready to overtake Frodo (you know how in movies distances can appear both close *and* far, like Gimli's head and Balin's Tomb in Moria), who appears on the other side of the river but Arwen and that Ranger guy. Arwen draws for her sword and calls out those immortal Tolkienesque words,

"If you think that you can claim him, then you're all wet!"

The Nine turn to evaluate this new threat, and as they are still in the water (don't worry for the horses, as during filming they could wear protective boots), Arwen mutters under her breathe and WHOOSH! The Nine are flushed away.

Frodo, falling from the horse, sees Arwen in all her glory...oh wait, we've already done that one...and then all fades to black.

To recap: No She-Elf, Arwen is given screen time and shown to be powerful. No horses are harmed nor have to appear at an awards show, Frodo is shown to still retain some backbone, and so what's not to like?