Erin Patterson's conviction for the deaths by poisoning of her estranged husband's relatives has prompted fevered speculation across Australia about her motive.

The Australian woman was convicted of murdering three elderly relatives of her estranged husband with a meal laced with poisonous mushrooms, and attempting to murder a fourth, in a case that gripped the country.

Driving off the south Gippsland Highway in regional Victoria, the road carves a path through the vast green pastures, hidden under a layer of lifting fog.Different shades of green mingle in the landscape while animals graze on the short grass.