Three Hallows, Two Weasleys and One Broken Girl

"You're going to die." She whispered.
Dumbledore chuckled awkwardly, patting the eleven year old reassuringly, "I'm one hundred and fifty one, that's a little inevitable I'm afraid, my dear."
The first year shook her head softly, a little frustration creeping into her expression, "you're going to die in eight years. Professor Snape's going to spell you off the astronomy tower, sir."

Delphi Lovegood is a puzzle wrapped in a mystery, with a side serving of Crumple-Horned Snorkack.
Is it any surprise the Weasley twins can't keep their eyes off her?
But why is she so reluctant to look back? What does she see?