Since 2004, she has been playing for the Dutch national senior women's team. In 2005, Hakhverdian stopped playing for ZVL and signed a contract with Ethnikos Piraeus (Athens, Greece), but returned within three months after internal mismanagement. Upon her return to the Netherlands, Hakhverdian signed a contract with Polar Bears and has been playing for them since.
Hakhverdian was part of the Dutch team that finished 10th at the 2005 World Aquatics Championships in Montreal. At the 2006 FINA Women's Water Polo World League in Cosenza and the 2006 Women's European Water Polo Championship in Belgrade they finished in 5th place, followed by the 9th spot at the 2007 World Aquatics Championships in Melbourne. The Dutch team finished in fifth place at the 2008 Women's European Water Polo Championship in Malaga and they qualified for the 2008 Summer Olympics in Beijing. There they won the gold medal on August 21, beating the United States 9-8 in the final.