1999 European Rhythmic Gymnastics Championships in Budapest Rangelova made her official debut, as a 14-year-old, where she took the Silver medal all around with 5 Ribbons.

[2] Teaming with Zhaneta Ilieva, Eleonora Kezhova, Zornitsa Marinova, and twin sisters Galina and Vladislava Tancheva in the competition, Rangelova performed a double routine using 5 Ribbons (23.400) and a combination of 3 Hoops and 2 Balls (25.200) to deliver the Bulgarian squad a first in the history Bronze medal with a score of (48.600).

After 2005 World Championships in Baku, Rangelova was determined to continue on with her passion and sporting career, together with all girls, from her team.

This is the first case in the history of rhythmic gymnastics, the Bulgarian team with Rangelova took 7th and 4th place in World Championships in Mie 2009, Japan.

She also captured the gold medal for the Bulgarian team in the group all-around tournament at the 2009 French Grand Prix Series in Thiais.