[1] Zafirova competed at the 2014 Junior European Championships with Boryana Kaleyn and Katerina Marinova, and they finished fourth in the team competition.

[5][6] In 2019, Zafirova joined Bulgarian senior group with Stefani Kiryakova, Madlen Radukanova, Laura Traets, and Simona Dyankova, replacing the injured Elena Bineva.

The Bulgarian team of the senior group, Boryana Kaleyn, and Katrin Taseva finished in fourth place.

[15][16][17] Zafirova was selected to represent Bulgaria at the 2020 Summer Olympics alongside Laura Traets, Stefani Kiryakova, Madlen Radukanova, and Simona Dyankova.

[20][21] The Bulgarian group withdrew from the World Championships in Kitakyushu, Japan, four days before the start of the competition, after an injury to Traets.

[22] Zafirova is engaged to David Huddleston, a Bulgarian artistic gymnast who also competed at the 2020 Summer Olympics.