In a world where Voldemort never fell, he carries out the plan he had for the diary since the day he gave it to Lucius Malfoy for safekeeping.

They destroyed the one person who might make them all worth saving.

The Fade shapes itself to your expectations, fears and desires. So maybe she could use it to find him. The night Aisling Lavellan defeats Corypheus, she looks for her missing elven apostate in the Fade.