Smith was born in Birmingham, England. She placed third over 100 metres at the 1989 AAAs National Championships and won the 1990 UK National title at 200m (also 2nd in the 100 m). However, it would be in the 400 metres that she would find international success. In 1991, along with Lorraine Hanson, Linda Keough and Sally Gunnell she was a member of the UK 4 × 400 m relay quartet that finished fourth in the final of the World Championships in Tokyo, setting a UK national record that would stand for 16 years.