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She didn't realize her mistake until she reached the final stretch and people starting yelling "you're in first!"
She was the first woman to cross the finish line, with a time of 3:11:48, good enough to qualify for the Boston Marathon.
Fitzmaurice said she had estimated she could do a half marathon, about 13 miles, in 1 hour 29 minutes.
When she didn't see a finish line at 1:31, she just kept running, following two men ahead of her.
Before that day, the farthest Fitzmaurice had run was about 20 miles.