After taking the bronze medal at the 2009 Mediterranean Games, she competed at the 2009 World Championships without reaching the final round.

She achieved a personal best of 14.72 metres in June 2011 in Chania – a mark which ranks her third among Greek female triple jumpers, after Hrysopiyi Devetzi and Paraskevi Tsiamita.

Papachristou was to compete in the 2012 Summer Olympics, but was expelled from the Greek team on 25 July 2012 after she posted on her Twitter account a message which has been translated to: "With so many Africans in Greece... the West Nile mosquitoes will at least eat homemade food!!!

"[4][5] This was in reference to a small outbreak of West Nile virus in Greece that had sickened at least five and killed one person.

[9] Papachristou took a break from track and returned in 2015 - after the birth of her daughter - with George Pomaski as a trainer.