The daughter of Eka, a Nigerian mother and Joe, a Ghanaian father who migrated to the United States,[2] Frimpong Ellertson played soccer throughout her childhood.

[3] Frimpong Ellertson originally signed to attend Santa Clara Broncos, but instead went to Washington Huskies closer to home after giving birth to her first daughter, MacKenzie, at age 18.

[4] On September 16, 2008, Frimpong Ellertson was one of the three players drafted for Saint Louis Athletica in the Women's Professional Soccer allocation of national team members, with the new league starting in April 2009.

[10] After April Heinrichs's reign as coach, Frimpong Ellertson tried out for the women's national soccer team, and earned her first cap against Ukraine on July 10, 2005.

She was named to the U.S. roster for the 2007 FIFA Women's World Cup and competed against Nigeria during group stage,[11] against Brazil in the infamous semi-final in which Hope Solo was benched in favor of more experienced Briana Scurry,[12] and against Norway in a 4–1 win in the third-place playoff match.