"I can hardly believe it," she said. "I will now have to speak to my bosses and see if I can get the time off work."
Tracey had only done one London Marathon before, over six years ago, when she made it to the finish line in over three and a half hours.
When she was 17, she ran for Welsh Schools, but spent 10 years away from
athletics before starting again to keep fit.
Over 30,000 runners braved the rain in the 24th London Marathon, which was won by Kenyans Margaret Okayo in two hours and 23 minutes, and Evans Rutto in two hours six minutes.