The accident left her with hemiplegia cerebral palsy on her right side as well as intercranial hypertension, epilepsy and autism.

[3] The intercranial hypertension means that she regularly needs to have excess fluid on the brain removed via a spinal tap.

The calcium build-up behind her eyes causes drusen which will one day lead to a loss of eyesight.

She was previously classed as an S10 swimmer for athletes with physical impairment however the International Paralympic Committee deemed her very mild physical impairment to not meet the eligible criteria for inclusion in Paralympic sport.

[3][4] At the 2013 McDonald's Queensland Multi Class Championships, she swam in 11 events and won seven gold and four silver medals.

[3] At the 2016 Australian Swimming Championships, she won bronze medal in the Women's 100m Breaststroke Multi-class in a personal best time of 1.21.31.

[10] At the 2020 Tokyo Paralympics, Leonhardt won the silver medal in the Women's 100 m Butterfly S14 with a time of 1:05.48, less than 2 seconds behind Valeriia Shabalina of RPC who set a world record.