A three-time All-American, Kellner finished 36th at the NCAA Cross Country Championships in 2012 and finished seventh nationally in the 10K in 2013 and 21st in 2012, both outdoors. She became the first Cornellian to win an individual cross country Heps crown since 1994 and helped the team to consecutive league titles, including the program's first in 13 years when the squad won in 2011. A two-time first-team All-Ivy cross country runner, she was the school record holder in the 10K with a mark that ranks fifth all-time in Ivy history. She was also ranked second all-time at Cornell in the indoor and outdoor 5K and ranked third in both the indoor and outdoor 3K. She was instrumental in helping her teams win a total of five Heps crowns (two cross country, three outdoor track and field), winning three individual championships along the way (10K in 2012 and 2013 outdoor, cross country in 2012).
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