http://mydeathspace.com/article/2009/01/22/Shannon_Quail_(18)_was_killed_in_an_auto_accident_ after_she_attempted_to_pass_a_tractor_trailer
I was going to submit this death as the accident occurred not far from where I live, just north of Pittsburgh, PA. The Myspace listed with the article is the same one I came across but I'm not positive that it is the correct one as according the obituary (http://www.pittsburghlive.com/x/pittsburghtrib/obituaries/index.html?mode=view&obit_id=165908) the deceased is from St. Louis, MO / Cranberry Twp, PA and Seneca Valley High School is located in Harmony, PA.
Whatever the case, though... RIP Shannon.