Exarchou competed as part of the Greek squad in a breaststroke double at the 2008 Summer Olympics in Beijing. Leading up to the Games, she cleared FINA B-standard entry times of 1:09.35 (100 m breaststroke) and 2:30.05 (200 m breaststroke) at the 2007 Summer Universiade in Bangkok, Thailand. In the 100 m breaststroke, Exarchou raced her steady stretch to sixth place and thirtieth overall by two hundredths of a second (0.02) behind Turkey's Dilara Buse Günaydın in 1:10.47. Three days later, in the 200 m breaststroke, Exarchou closed out the field in heat three to last and thirty-ninth overall by nearly ten seconds behind Belarus' two-time Olympian Inna Kapishina in 2:36.83. failing to advance to the semifinals.