Here's why:
* She chose to die in Lothlórien: Arwen chose to die in Lothlórien, the land of her ancestors, surrounded by her family.
* She chose to become mortal: Arwen renounced her immortality as an Elf and chose to become mortal to be with Aragorn.
* Her fate is unclear: The precise details of her passing and the nature of her burial are not explicitly stated in Tolkien's works. It's likely that she was laid to rest in a tomb in Lothlórien, but the specifics remain unknown.
Some fans speculate that her burial site could be near the Barrow-downs, where her father, Elrond, eventually returned to after his time in Middle-earth.
Ultimately, the exact location of Arwen's burial remains a matter of speculation and individual interpretation.