On April 16, 2005, in Magdeburg, Germany, Regina Halmich won a ten-round unanimous decision over Dunaway, defending her Women's International Boxing Federation flyweight title.
On February 16, 2006, she successfully defended her Women's International Boxing Association (WIBA) mini flyweight title against Shaffer in Kansas City, Missouri, winning in a unanimous decision (100-90, 99-91, 99-91).
On September 21, 2006, she defended her WIBA mini flyweight world title for the second time against Dee Hamaguchi, knocking her down twice in the first round and winning the match by seventh-round stoppage.
On February 28, 2009, she lost in South Korea against Hi Jyun Park for the International Female Boxers Association mini flyweight title.
She lost to Katia Gutiérrez on April 16, 2011, in a fight for the vacant International Boxing Federation mini flyweight title.