I don't think the two were related at all. It was just coincidence.
"The reason the single has problems was because this release came 5 days before 9/11 happened and that kind of backfired on Chihiro. infection became somewhat less likened because it rather foretold, with some of the lyrical content..."
Source:
http://solarblade.wordpress.com/2009/09/
Obviously, she wrote the lyrics long before she could even imagine what would happen.
When I listen to the song, I imagine vampires, though. Bram Stoker, not Stephenie Meyer.