She is awakened by a ceramic plate crashing down on her head. She rises slowly, no longer reacting with fury as she once did. She doesn't even scream any more. She does turn away from the Dementor. Crawl into a corner, shaking bits of plate from her hair. Maybe Dementors have no sense of humor, but it does not stop them from being cruel.
The Dementor doesn't bother to linger; it knows she has nothing left. Drawing a deep, rattling breath, it moves on. She grabs the stale bread, bites into it greedily.
That's when it happens. She doesn't think of skepticism;they had prevented the imprisoned Death Eaters from touching their Marks years ago. A fierce, warm feeling spreads through her body. She's laughing maniacally, trying desperately to reach her Dark Mark. She knew this day would come, waited for it for thirteen years.
The Dementors sense her happiness; they swarm around her cell in the dozens. In an instant, her happiness is gone. Her laughter stops, her mouth dry. But they won't be able to take away the spark of hope reignited in her chest.
Because her Dark Mark burned.
The Dark Lord is returning at last.