Career
She represented Bulgaria in two editions of the Olympic Games (2004 and 2008), and also contributed to a fourth-place effort in the group all-around tournament at the 2007 World Rhythmic Gymnastics Championships in Patras, Greece. During her sporting career, Marinova trained for Iliana Gymnastics Club in Levski under her head coach Adriana Dunavska and her assistant coach Mariela Pashalieva. 2004–2007
At the 2007 World Rhythmic Gymnastics Championships in Patras, Greece, Marinova and her newly structured squad missed the podium by two-thousandths of a point with a fourth-place score in 33.600.
2008 Summer Olympics
Teaming with Tsveta Kousseva, Yolita Manolova, Maya Paunovska, Ioanna Tantcheva, and Tatyana Tongova in the competition, Marinova performed a double routine using five ropes (16750) and a combination of three hoops and two clubs (16800) to deliver the Bulgarian squad a fifth-place score in 33.550.