Wellman qualified for the women's 50 m freestyle, as a 16-year-old, at the 2004 Summer Olympics in Athens, by receiving a Universality place from FINA, in an entry time of 28.39. Swimming in heat four, she raced to fourth place by 0.13 of a second behind Aruba's Roshendra Vrolijk in 28.56. Wellman failed to advance into the semifinals, as she placed fiftieth overall out of 75 swimmers on the last day of preliminaries.