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.
Cycling: Bostock nominated for national champion of the year
Manxman one of six riders on British Cycling shortlist
Football: Railway Cup hopefuls all maintain pace in premier league
Castletown stay four points clear atop Division 2
Rugby: Vagabonds Ladies stay top with another victory
Vagabonds men and Douglas also take respective wins on home soil
Hockey: Harlequins A beat rivals to close in on prem leaders
Bacchas B take important victory in battle for top-flight safety