Australian woman Erin Patterson's lawyers argue that errors during the trial led to an unfair conviction, while prosecutors say her 33-year minimum prison term is too lenient.

The court also found that Patterson's original jail sentence - which saw her eligible for release after 33 years - did not match the gravity of her crimes.

Australian mushroom murderer Erin Patterson lost a bid to overturn her convictions, failing to prove she was wrongfully jailed for killing three people with a poisoned lunch.