Natalie du Toit saw her hopes of qualifying for South Africa's Olympic squad fade after she failed to qualify at the national championships.
But the 20-year-old, who lost her left lower leg in an accident in 2001, will compete at two more meetings in a bid to reach the 800m freestyle mark.
"It has always been her dream to compete at the Olympic Games," said her manager Dave Rundle.
"She believes she has the ability to get there, and it is in her nature to keep going."
Du Toit's time during the national Olympic trials this week was more than 20 seconds off the qualifying mark.
Now, the South African will race at two meetings in France and Barcelona in June in a bid to set the necessary time.
Du Toit won two gold medals in the multi-disability 50m and 100m freestyle at the 2002 Commonwealth Games.
Aside from her Olympic ambitions, she will be focussed on turning those medals into Paralympic titles at her first Games this September.