In the prelims heats of the 400-metre freestyle on 7 August, Belmonte ranked 15th with a time of 4:08.12 and did not advance to the final. The next day, in the 200-metre individual medley on 8 August, Belmonte ranked 15th in the prelims heats and qualified for the semifinals where she ranked 16th overall and did not advance to the final.