Eight years after competing in her last Olympics, Rondelez qualified for her third Belgian team, as a 36-year-old, in the RS:X class at the 2012 Summer Olympics in London by receiving a berth from the ISAF Sailing World Championships in Perth, Western Australia. Rondelez missed a chance to sail in the medal race with a seventeenth-place finish after ten opening rounds, accumulating a net score of 150 points.