Erceg made her full
Football Ferns début in a 0–3 loss to
China on 14 November 2006, and represented New Zealand at the
2007 FIFA Women's World Cup finals in China, where they lost to
Brazil 0–5,
Denmark (0–2) and China (0–2). Erceg was also included in the New Zealand squad for the
2008 Summer Olympics where they drew with
Japan (2–2) before losing to
Norway (0–1) and
USA (0–4). In
the following tournament, Erceg helped New Zealand reach the quarterfinals, the Ferns' first ever knockout game in a FIFA tournament. There they lost 2–0 to the United States. She was included in the U-20 squad for the
2008 Women's U-20 World Cup finals in Chile. Erceg earned her 50th cap for New Zealand aged just 21 when starting New Zealand's
2011 Cyprus Cup opening match against the
Netherlands on 2 March 2011 and becoming the third most capped female player in New Zealand Football history with 62 caps to her name. Erceg was also a part of the team that qualified for the
Women's Football World Cup that took place in Germany, in 2011 where they finished 12th overall. Erceg's experience led her to be named
captain of the Football Ferns in 2014. She featured in all New Zealand's three matches at the
2015 FIFA Women's World Cup in Canada. Erceg was named for the 2016 Olympics squad, which will be her sixth international tournament representing New Zealand. In February 2017, Erceg announced her retirement from the international game on social media, writing "Due to the unfortunate and unfavourable circumstances within the organisation that is NZF, it is with regret and great sadness that today is the day that I announce my retirement from the international game. Without being able to justify my involvement any longer I will be stepping back in the hopes to create change for the current and future generations of NZ footballers." In February 2018, Erceg came out of retirement to play for New Zealand in their two friendlies against
Scotland in Spain. She then retired again for the second time in May 2018 before New Zealand's friendly against
Japan. In January 2019, Erceg came back out of international retirement ahead of the
2019 Cup of Nations and the
2019 FIFA Women's World Cup. In April 2019, Erceg was named to the final 23-player squad for the
2019 FIFA Women's World Cup. In June 2021, Erceg was named to the roster for the
2020 Summer Olympics. In January 2023, Erceg again retired from the national team. ==International goals==