A 3–0 defeat to the United States in January 2004 was Thunebro's first appearance for the senior Swedish national team. She had already collected 32 caps at Under–23 level, eight at Under–19 and 10 at Under–17. She remained on the fringes of the squad but was left out of the selection for UEFA Women's Euro 2005. Thunebro travelled to China for the 2007 FIFA Women's World Cup but made just one appearance during Sweden's exit at the group stage. Returning to China for the following year's Olympic football tournament, Thunebro had become a regular starter in the team which reached the quarter finals.