Lindsay Sandiford could seek a judicial review if Indonesia's Supreme Court rejects her latest death penalty appeal, human rights campaigners have said.
However, such a move would largely depend on whether new evidence had come to light, they added.
After that, her final resort would be to seek a reprieve granted by the country's president.
More top news
Tony Blair has called for Remain voters to persuade Brexit supporters that the UK is better off in the EU.
The 29-year-old victim, Manmeet Alisher, was described as a much-loved member of Brisbane's Punjabi community.
A husband and wife have been sentenced to lengthy prison terms after subjecting their daughter to horrific abuse for over a decade.