Group manager for intelligence investigations and enforcement Chris Howley said the woman was lucky to be alive.
"Drugs themselves are dangerous but when they are swallowed there is a very real risk that the pellets could burst with a potentially fatal outcome," he said.
Police helped Customs with inquiries and interviews throughout the operation.
"People trying to smuggle drugs go to great lengths to hide them, and Customs is continually reviewing its methods to improve detection", Mr Howley said.
Syndicates using couriers did not care about the health and or penalties the couriers face when trafficking drugs across borders, he said.