Did she really have anything holding her back? She was not in a committed relationship, married or have dependants. Her parents had died in a car crash in Australia; they had died not knowing they had a daughter, a witch fighting in a magical war in Britain. Her job was intriguing, but she was not irreplaceable; if she ever died, her co-workers and boss would be saddened but they would move on without much difficulty. A few of the Weasleys, her old teachers, and a few friends might grieve but they had drifted apart since graduation. The only ones who would truly mourn her death were Harry and Luna.