Dangalakova qualified for the women's 400m individual medley at the 2004 Summer Olympics in Athens, by attaining a B-standard entry time of 4:59.51 from the European Aquatics Championships in Madrid, Spain. She finished behind winner Nimitta Thaveesupsoonthorn on the first heat by less than six hundredths of a second (0.06), in a time of 5:01.00. Dangalakova failed to qualify for the final, as she placed twenty-third overall in the morning's preliminary heats.