Matsa was also selected as a reserve for the Greek squad at the 2012 Summer Olympics in London, but did not compete in the 4 × 100 m freestyle relay. Her Greek teammates Niangkouara, Theodora Drakou, Theodora Giareni, and teen sensation Kristel Vourna failed to reach the top 8 final, finishing only in sixteenth place with a time of 3:45.55.