Zachariadi, who was born in Greece, was diagnosed with Hodgkin's lymphoma in 2011 and her condition worsened in the past few of months.
She slipped into a coma last week at Attiko Hospital in Greece, and doctors confirmed she had died this morning.
In October 2010, she lept to silver at the Commonwealth Games in New Delhi, repeating a feat at the Mediterranean Games in Italy a year earlier.