ok, it was written before the death, but not recorded, as she said on 199:
http://www.ahsforum.com/forum/showthread.php?t=65637 in fact, she knew about the death before the recording...
but a couple of days later, she put this message, no. 200:
http://www.ahsforum.com/forum/showthread.php?t=65698, the last part of the song and from my point of view, she was relating the song to the event.... methinks