She was invited by FINA to compete as a lone female swimmer for Burkina Faso in the 50 m freestyle at the 2008 Summer Olympics in Beijing, China. Nikiema competed in the second heat of the competition, finishing in sixth place. Her time of 34.98 seconds set a new national record, having promised to beat her own record prior to the race taking place. She had finished ahead of Elsie Uwamahoro of Burundi (36.86 seconds) and Niger's Mariama Souley Bana (40.83 seconds). The heat was won by Zakia Nassar from Palestine, with a time of 31.97 seconds.