Arwen didn't need the character development necessary for the other characters. Tolkien was an author who only put details into his story, if his reader(s) really needed them to understand the story. Arwen was a behind-the-scenes character, because her main purpose was to provide inspiration and courage to Aragorn, and shore up his strength whenever it waned. For that sort of purpose, you don't really need much character development.
Lord of the Rings is from a Hobbit's perspective. The only reason we're given character development for the non-Hobbit members of the Fellowship and main characters is that one or the other of the Hobbits meets them face-to-face, and gets to know them. The only Hobbit who even got close to meeting Arwen was Frodo, and even he didn't even speak to her. How can you get to know someone if you don't even speak to them?
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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