This attack was most likely by bull sharks (Carcharhinus leucas) rather than by great whites which are very solitary beasts. The beach where she was injured was is a lovely spot and I'd be quite happy to fly there and swim tomorrow.
They had a GW wash up in Port Elizabeth, claimed it to be around 8m but in reality it was around 6. It had a whole seal inside it. There was also a 1000lb Bull shark that washed up, had a whole side of beef in it and canned food!