Rignall competed only in the women's 50 m freestyle at the 2000 Summer Olympics in Sydney. She achieved a FINA A-standard of 25.85, a national record, from the German Championships in Berlin. Rignall shared a ninth seed with Sweden's Anna-Karin Kammerling in the semifinals at 25.61, but missed a spot for the top 8 final by 12-hundredths of a second. Earlier in the prelims, she posted fourth-seeded time and a New Zealand record of 25.52 from the final of ten heats, pulling herself off with a seventh-place finish.