Tollefson ran collegiately at Villanova University where she won the 1997 NCAA Cross Country Championships and the 1999 NCAA Outdoor and Indoor 3000 meters and Outdoor 5000 meters. She graduated from Villanova with a communications degree in 1999. At the US Olympic Trials in 2004, she won the 1500 meters. She competed in the 2004 Olympic Summer Games, making it to the semis in the 1500 meters. In 2004, she was ranked #1 nationally by Track and Field News.
In 2006, she won the 4K race at the USA Cross Country Championships, took the 3000 meters US Indoor National Championships and was ranked #5 nationally at the end of the season. She now holds a distance camp at St.Kates, for teens.
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