Arwen with price tag.

[Olmer]

"Therefore, though I love you, I say to you; Arwen Undomiel shall not diminish her life grace for less cause. She shall not be the bride of an't man less than the king of both Gondor and Arnor. “
Naturally, any parent at given situation would be looking for a good reason to avoid such untimely and sad death of the child,as it was in prospect for Arwen.
But Elrond, allthought that he set out almost impossible conditions, did not dismiss Aragorn's claim alltogether, but just put a higher bid on his daughter.
How come that 2700 yers old young girl could not find a better suitor before?
What about valiant and handsome Glorfindel? Erestor? Gildor?..Was it put just similarly impossible demands on anyone who was seeking Arwen's hand?
Why father, but not she herself, was putting conditions on the future marriage? Her grandma seems never put herself in position to stay under anyone order. Why Arwen happily goes along with her daddy decision?
The answer is only one : because she DID NOT CARE. She was not in love with nobody, not even Aragorn.
At the given time this marriage was a politically essential arrangement for the elves .