Woman accused of killing 3 with toxic mushroom-laced meal heads to trial / New details revealed about mom accused of toxic mushroom murders / Woman on trial charged with murdering ex-husband's relatives with poisonous mushrooms / Ex-husband rejected alleged killer's invitation to poisonous mushrooms lunch, court hears / Trial begins for woman accused of murdering ex's family with beef Wellington laced with poisonous mushrooms / Toxic mushroom meal was 'terrible accident', says woman on trial for murder / Woman suspected of killing three people with toxic mushrooms 'faked cancer diagnosis to lure them to meal' / Australian stands trial charged with murdering ex-husband's relatives with poisonous mushrooms / Woman accused of murdering 3 with toxic mushrooms faces trial / Woman suspected of killing three people with toxic mushrooms in beef wellington goes on trial