In 1988, she ran her fastest ever marathon, when winning in Osaka with a time of 2:23:51, which at the time made her the fourth-fastest woman marathon runner in history, behind Ingrid Kristiansen, Joan Benoit and Rosa Mota. Later that year, she won a silver medal at the 1988 Seoul Olympics in 2:25:53, 13 seconds behind Mota. In January 1990, she retained her Commonwealth marathon title at the Auckland Games. In a solo performance, she finished over seven minutes ahead of silver medallist Australian team-mate Tani Ruckle. Her time of 2:25:28 remains a Games record (as of 2014). Divorced from Martin, she married Kenyan distance runner Yobes Ondieki in 1990 and missed the rest of that season due to pregnancy, giving birth to their daughter in November 1990. In 1991, she achieved her third top three finish at the New York Marathon, finishing third in a race won by Scotland's Liz McColgan.