Disclaimer: I don't own Harry Potter or the song... geeze; I've done this one enough...
Whisper
Of course he knew her, how could he not? He was the headmaster, he knew all at Hogwarts. He knew her very well, even though she kept some secrets from him. He remembered when she came back from one of her adventures, and his heart pained at the sight of her... she was changed and never smiled like she used to, at least not for a long while. He knew there was little he could do to help her, but her friends did help to heal some of the wounds, both emotional and physical. She was always a surprise, and even if she was hurt, he knew all to well that she would be right back into the fray of a fight. He actually had to ask her help once in a while, all because she had some powers even he had never heard of. Dumbledore always knew when there was a practical joke being played or one that had been played, she was behind it. She was always receiving improper use of magic forms, but that, he thought, was just a formality. He did however; know some things that really weren't meant to be known...
For instance, the scar that ran down the length of her back diagonally. She never knew her parents, so he tried to be somewhat of a father figure to her. She was the only one ever miss sorted by the Sorting Hat, and that was fixed. She hated snakes, absolutely loathed and despised them. He knew that because he saw a trick played on her with a plastic muggle snake and she hid until it was on fire and burning to ashes. He knew, he was the one that lit the snake on fire. He watched her grow as she would, with falling for Severus and making a friend like Lily, and he found out later that they knew on another before she even started school. He never knew, however; the secret between the two and he really didn't mind, although it did bother him somewhat. He decided to leave it be however, for she wouldn't cause trouble with it, her or Lily. They were trouble makers, but if the secret was that deep, nothing bad would come of it. He remembered she liked the dark of night...
Of course he was there on that fateful night. He witnessed the tears of everyone there and saw the blood. He felt the pain with everyone, and he knew that even though he knew her, Dumbledore didn't know her as well as her friends did. That was why it almost broke his heart to see Lily, for the only thing that seemed to keep her from killing herself was the prospect of Lily and James' child, who was on the way. She seemed to feel hope, Lily did, towards the life that grew inside of her and that seemed to give her the strength to move on just a little bit better than before. Dumbledore did however give her many calls, always wanting to make sure she was all right, and he was always with Remus when he went to clean her grave, well, hers and Lily's and James' as well. It was hard to know them and then not be able to see them again. And yet there was hope.
He did know of the forest temple, of course he did, he had visited it frequently. She was its guardian and she did her job well. He often would say a small prayer there whenever he visited, for the health and safety of everyone in the school, but maybe he should have prayed harder.
She was the heir of two houses, both Slytherin and Gryffindor, and she knew just about everything there was to know about them too. Dumbledore would often smile at that fact, because one year, a report was due on the house founders, and she was the only one to ace it. She was the only one that could do a lot of things. She saved the school, she even had saved him.
At least she wasn't in pain anymore, he hoped, and maybe the other hope inside of him was true, she was alive...