Cox also confirmed that a potential clash with last year's Cox Plate hero Romantic Warrior in the G1 Hong Kong Cup (2000m) in December has been ruled out.
"She hasn't completely acclimated to Southern Hemisphere seasons," he said.
"To take her back into the Northern Hemisphere, albeit only for a month or six weeks, potentially jeopardises the progress she's made and we'd really like to keep her racing in Australia and racing really well.
"That was a tough call because the boss, Mr Zhang, was very keen to take her to Hong Kong.
"It would be a big face, to use a Hong Kong or Chinese expression, for him to have a very serious horse in one of their premium international races."