Pennie won a bronze medal at the Junior World Championships in
2000 and won the overall Junior World Cup Series in the same year. As an Under 23 athlete, she won a team bronze medal in 2004 and an individual bronze medal in 2005, both at the
European Under 23 Championships. She competed in the K1 event at the
2008 and
2016 Olympics and placed 17th and 6th, respectively. She won seven medals at the
ICF Canoe Slalom World Championships with two golds (K1 team:
2019,
2021), three silvers (K1:
2006,
2014; K1 team:
2015) and two bronzes (K1 team:
2007,
2018). She became European Champion in the K1 (solo
kayak class) event in 2013. She won a total of 8 medals (3 golds, 1 silver and 4 bronzes) at the
European Championships. ==World Cup individual podiums==