Human rights campaigners expect Indonesia's Supreme Court to make a decision in Lindsay Sandiford's case "within 96 days" from her lodging an appeal today.
Zoe Bedford, from legal charity Reprieve, said:
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.
A British grandmother who has been sentenced to death by firing squad for drug smuggling in Bali has lodged an appeal at Indonesia's Supreme Court, pressure group Reprieve has said.
It is Lindsay Sandiford's second bid to overturn her death penalty after she lost her first appeal at the Bali High Court last month.
Balinese police claim the 56-year-old was at the centre of a drugs-importing ring after bringing £1.6 million of cocaine into the country. She denies the allegations.
A grandmother from Cheltenham who is facing the death penalty in Bali after being convicted of drug smuggling said she feels let down by the British Government.
Lindsay Sandiford was sentenced to death by firing squad by a court in Indonesia for taking £1.6m of cocaine into the country.
Sandiford said by refusing to assist in funding her lawyers, the Government's actions were "tantamount to condoning the death penalty".
A Foreign Office minister said today that the Government remained "deeply concerned" about the fate of British grandmother Lindsay Sandiford, who faces the death penalty in Indonesia, but warned her legal bills would not be covered by the Government.
Hugo Swire said British diplomats had worked closely with Sandiford's legal team but speaking at Foreign Office questions in the Commons, he rejected a plea from her former MP Martin Horwood for financial aid.
Sandiford was sentenced to death by firing squad by a court in Bali for taking £1.6 million of cocaine on to the island.
Earlier this month Sandiford, originally from Redcar, lost the first appeal to the Bali High Court but is expected to take her case to Indonesia's Supreme Court.
British grandmother Lindsay Sandiford, 56, has lost her appeal over a UK Government refusal to fund her legal challenge against a death sentence imposed by an Indonesian court for drug smuggling.
Lawyers representing a grandmother from Cheltenham, who's facing a death sentence in Bali, will go to London's Court of Appeal today, after the Government refused to help pay her legal fees.
Lindsay Sandiford, who is 56, was sentenced to death for drug offences in January. She needs to raised 8,000 to pay for a local lawyer.
Action group Reprive said Lindsay Sandiford faces the death penalty because "she has no money to hire a lawyer for her appeal".