Saifi's first major international success came at the 2011 IPC Athletics World Championships in Christchurch, where she entered both the discus throw and the shot put. Although finishing ninth in the shot, she threw a distance of 40.99 metres to win the gold medal, an improvement of over six metres on her Beijing best. The following year she appeared at the 2012 Paralympics in London, winning gold in the discus and making her the joint World and Paralympic champion.