Cricket Australia confirmed the injury in a short statement.
“Molyneux suffered an acute rib fracture after being hit in the chest by a ball whilst batting last week,” the statement read.
“Harris has aggravated a calf injury she suffered with The Hundred and while preparing for next season. She is currently undergoing a graduated rehabilitation and return to playing program.”
Australia are in Group A in the T20 World Cup with India, New Zealand, Pakistan and Sri Lanka.