She had been treated cancer since June 15 at Siriraj Hospital .
2 : Her Royal Highness Princess Galyani Vadhana ( pictured ) dies at age 84 .
Galyani Vadhana had been treated cancer since June 15 at Siriraj Hospital .
2 : Her Royal Highness Princess Galyani Vadhana ( pictured ) dies at age 84 .