Lily Choy was sentenced in 2011 to six years in prison after she was found guilty of manslaughter for a second time.
In a ruling Monday the appeal court increased that by two years for a total of eight years, minus time served.
The boy died on Jan. 27, 2007, after his head hit a toilet and doctors couldn't control the swelling in his brain.
The Crown had argued that the boy's death was a case of "near murder", and that the trial judge made a mistake when determining the original sentence.
The appeal court did not agree the case was "near murder", but ruled the original six-year sentence was not harsh enough.
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