She meets him between the trees of her grandmother's forest and she falls in love, as he does before leaving and swearing to marry her.
And the whispers start then.
Such a loss.
It's in her blood.
Just like Luthien.
Her father smiles at her, at both of them, and approves their courtship, but there's a shadow in deep in his eyes that never leaves him since that day. She knows he's thinking about his twin, the uncle she never met and that had chosen a mortal life so long ago.
She will die, and she won't return from Mandos.