From 2004 to 2014 she represented the Faroe Islands women's national football team at senior international level.

The Faroe Islands Football Association (FSF) relaunched their senior women's national team in 2004 after an eight-year hiatus.

[5] The match was staged in Klaksvík on 12 October 2004, the day before the nations' senior men's teams met at Lansdowne Road, Dublin.

[6] In 2012, Wardum and her KÍ teammates Malena Josephsen and Rannvá B. Andreasen simultaneously became the first Faroese women to win 25 caps.

She played, outfield, for Kyndil and was part of the Faroe Islands women's national handball team.