An Australian woman who killed her two children has arrived back in Australia after serving her sentence in Canada, local media reported Wednesday.Alysson McConnell, 34, arrived at Sydney Airport on an Air Canada flight with her mother Helen Meager on Wednesday morning, the Australian Associated Press (AAP) reported.McConnell refused to answer questions from waiting media as she and a female companion pushed a luggage trolley to the airport car park.The 34-year-old woman was sentenced to six years in jail after she admitted to drowning her two sons aged two and 10 months in a bathtub in her adopted home town of Millet in central Alberta, Canada, in 2010.However, she was released after spending 10 months in a psychiatric hospital in Alberta.In sentencing McConnell, the judge found she was suffering psychological issues and there was doubt she had the specific intent to kill her sons.Alberta\'s Justice Minister Jonathan Denis has vowed to extradite McConnell from Australia, saying the punishment is not enough