Eleanor Kathleen Taylor, 19, was sentenced at the District Court of Western Australia, Perth, after pleading guilty to importing the drug.
The teenager, from Oxford, was arrested in April after a flight from London via Amsterdam and Johannesburg.
The court was told she was paid £5,000 to act as a drugs mule.
The drugs, with a street value of A$200,000, were found hidden in the lining of her suitcase during a routine search.
Judge Antoinette Kennedy said Taylor, who had no previous convictions, was "naive" and told her to serve three years before she could be considered for parole.
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