Imelda Marcos, 89, is facing a jail sentence of between six and 11 years for each count of graft.
She was first convicted by the anti-graft court in 1993, seven years after the popular revolution that ousted her husband and sent the family to exile in Hawaii. She is also perpetually disqualified from holding any public post. Imelda's son Ferdinand "Bongbong" Marcos Jr narrowly lost the vice-presidential election in 2016, a result he is now challenging, and many see him as the natural successor to President Duterte.
"She can elevate it to the Supreme Court if she sees grave abuse of discretion in the Sandiganbayan's decision".
However, as Imelda is allowed to appeal to the Supreme Court, she can continue in her position as a member of the House of Representatives, whose mandate ends next year.
Congressman Tom Villarin of the opposition Akbayan Party said Marcos "can't invoke her age nor humanitarian grounds for her not to serve the sentence".
She said former Court of Appeals justice Manuel "Lolong" Lazaro would act as her interim counsel as her other lawyer, Robert Sison, is confined at a hospital.
Government prosecutor Ryan Quilala told reporters that Marcos and her husband opened and managed Swiss foundations in violation of the Philippine Constitution, using aliases in a bid to hide stolen funds.
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The Philippine government is fighting dozens of suits overseas to claim art and property owned by Ferdinand Marcos and his cronies.
Despite the ostentatious wealth amassed by the Marcos family while their country sank deeper into poverty - Imelda's shoe collection is an especially notorious example - they have not been successfully prosecuted for graft.
However, she can still appeal the conviction.
Former Senator Rene Saguisag also welcomed the decision of the anti-graft court.
Neither Marcos nor her lawyers were present at the promulgation of the decision.
Headway only began to be made in the case when the Swiss Federal Court ruled in 1997 "that the majority of the Marcos foundation assets were of criminal origin".