 Complete the following phrase:  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 