Here is another link.http://harlemrunner.blogspot.com/2008/03/sarasota-marathon-winner-pulls-katie.html
Race spotters did not see here and were looking for the leaders.
When you look at the map it would be VERY EASY to cut off 2 miles as there is an out and back section there. You could go from 16.25 miles to the 19 mile mark with no trouble at all.
The link I posted to has someone saying she may not have realized they put another mat out there to catch this exact type of cheating.
Not only did she miss the mat at mile 17, the newspaper article says she missed the mat at mile 18. http://www.heraldtribune.com/article/20080306/SPORTS/803060743
It is also interesting that the splits do not give times for the 18 miles split. It looks exactly like the organizers did this to catch people. Good for them.
She does have one other time around the time she finished at, but also the article seems to show times arounf 3:30 as well.