The Crown has launched an appeal of an Alberta mother's sentence for drowning her two young sons in 2010.

Allyson McConnell, 33, was found guilty of manslaughter in April 2012 in the deaths of her two sons, 2½-year-old Connor and 10-month-old Jayden in February 2010 at their Millet, Alta.,  home during a divorce battle with her husband.

She was sentenced to six years in prison on each charge. Justice Michelle Crighton gave her two-for-one credit for time already served, which left McConnell with 15 months left to serve and before being eligible for in March 2013.

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Curtis and Allyson McConnell are shown with sons Connor and Jayden in an undated photo. ((Facebook))

This new appeal was filed last week.

The Crown previously appealed in May to have the manslaughter conviction changed to second-degree murder.

Both appeals have yet to be heard.

During the trial, the prosecution argued McConnell killed the boys as revenge against her husband, who had refused permission to let her return to her native Australia with the boys.

However, the defence had said the fact McConnell suffered from severe depression coupled with her use of  alcohol and sleeping pills meant she could not have formed the intent required to convict her of second-degree murder.