On 23 February 1997 in Birmingham, she cleared 1.95 metres to set a British indoor record, which stood for 17 years (1997–2014).

A prodigious talent, Marti cleared 1.81 m at the age of fourteen in 1982 before achieving 1.88 m at 15 in 1983 to win a European Junior Championships bronze medal.

In 1992, she competed at her first Olympic Games in Barcelona, where she achieved an outdoor PB of 1.92 m in the qualifying round before clearing 1.91 m for ninth in the final.

[3] Shortly after the 1992 Games, she improved her outdoor best to 1.93 m. Marti would continue as the UK's most consistent jumper for several years, although she was forced to withdraw from the 1993 World Championships due to injury.

After a few low key years, Marti concluded her international career by finishing sixth at the 2002 Commonwealth Games in Manchester.