In 2011, Hollermann became the youngest person to ever make the national team, and won a gold medal at the 2011 Parapan American Games in Guadalajara, Mexico. The following year she made her Paralympic debut at the 2012 London Paralympics. In 2014 the University of Texas at Arlington (UTA) awarded her a full athletic scholarship to play on its new Lady Movin' Mavs wheelchair basketball team. She won gold again at the 2015 Parapan American Games in Toronto, Canada.