Miriam was named to be part of the Paralympics New Zealand team to compete in Para swimming at the Paralympic Games in Athens 2004. Miriam placed sixth in her heat of the S9 Women’s 400m freestyle.
The following year, she won titles at the CP-ISRA World Championships in Connecticut, in the 100m freestyle, 400m freestyle and 200m individual medley, as well as the 800m track race.
She first competed in triathlon while in high school. In 2009 she was one of the first New Zealanders to be selected to compete at Para Triathlon World Championships, where she won gold. She also won bronze at Worlds in 2012.
Miriam worked at the Department of Conservation in Aoraki Mount Cook before taking a position at the International Paralympic Committee in August 2019.
Miriam officially received her ‘numbered’ Paralympic pin as part of The Celebration Project in Bonn, Germany in October 2019.
The New Zealand Olympic Committee announced that Miriam was one of 18 athletes selected to their Wahine Toa programme in May 2023.