Dumitru represented her nation twice at the World Sprint Speed Skating Championships for Women: in 2006, finishing 33rd overall and in 2010, finishing 24th overall. She won the bronze medal at the 2010 North American Speed Skating Championships. She participated at the European Speed Skating Championships for Women in 2005, 2006, 2007 and 2009. She also competed at other international competitions, including at ISU Speed Skating World Cups.