Miller was a 12-letter varsity athlete competing in track and field, cross country and basketball at North Myrtle Beach. She was a member of the two-time region championship winning team in track and field (2007 and 2011). She was a region championship winner in the 800-meter run, the mile and 4x800-meter relay in 2007. Miller was a four-time region championship winner in the 4x400-meter relay (2008-2011) and a three-time region championship winner in the 4x800-meter relay (2007-2009). She was a four-time state qualifier in the 4x400 relay and three-time state qualifier in the 4x800 relay. Miller was a member of the three-time region championship winning team in cross country (2007-2009) and was a member of the four-time lower state and state qualifying team in cross country from 2007-2010.
Miller was a four-time first team All-Region selection in track and field in the 4x400 (2008-2011), in the 800 and the mile in 2007 and three times in the 4x800 (2007-2009). She was awarded the track and field MVP award in 2007, 2010 and 2011. Miller was named Most Valuable Female Senior Athlete in 2011 and a Scholar Athlete in 2010-2011. She was named an Iron Chief in 2011 for competing in three sports every year since her freshman year. She won the All-Academic award in 2010 in cross country and in 2011 for basketball and track. She was a 2010 cross country team captain, 2010 and 2011 track and field team captain and 2011 basketball team captain.
Miller was a member of the National Honor Society, National Senior BETA club, Mu Alpha Theta Society, National English Honor Society and the National Science Honor Society. She also won the Palmetto Fellows Scholarship award and the Mildred Ward Athletic Scholarship in 2011.