Harriet Pryke was in action in Oordegem in Belgium on Saturday evening at the International Flanders Athletics meeting.
The Martin Bullock-sponsored athlete ran the 400m B race and won in 54.81 against athletes from Belgium, France, the Netherlands and Ireland.
The IOM Sport Aid-recipient will be competing again this coming weekend in Birmingham at the England Senior Track and Field Championships, which this year also incorporates the North of England Championships.
Tributes paid to Island resident and Olympic Silver medallist, Maurice Herriott
"A remarkable athlete, and a big part of our community."
Netball: Men's team selected for England competition
Eleven strong squad heading to Loughborough
Billy Harris beaten in US Open Qualification
Island player lost by two sets to one
'She changed my life': Tributes paid to former schoolteacher
'Mrs Messenger' was a netball coach and taught at Castle Rushen High School