The freshman at Monticello High School finished eighth out of 145 freshman and sophomore runners from throughout the United States. The top 25 finishers are named All-American.
The race was run in bitter cold conditions at Rim Rock Farms, a nationally recognized cross country course in Lawrence, Kansas.
It has been a busy two months for Nielson since she dominated the Utah state cross country meet in October. She was invited to join the Sojourners, an Orem-based team that participates in USA Track and Field races.
Macee was first in a state race and second in a regional race to qualify for the national race.
In another race, she placed third out of 133 freshmen running in the Footlocker West Regional Championship in Los Angeles, CA.