In the first round of elimination, she faced 8th-ranked Kim Kyung-Wook of Korea and lost 157-164 in the 18-arrow match to the future Olympic gold medalist.

In the third place match, Marcinkiewicz's team defeated Turkey 244-139, winning a bronze medal.

In that round, she faced Zhang Juanjuan of China, losing to the 5th-ranked archer 166-157 in the regulation 18 arrows.

Marcinkiewicz was also a member of the 15th-place Polish women's archery team, together with Justyna Mospinek and Małgorzata Sobieraj.

At the 2008 Summer Olympics in Beijing Marcinkiewicz finished her ranking round with a total of 620 points.