When Mason Jet Lee needed his mother the most, she wasn't there.

Now Anne Maree Lee, 29, has been jailed for manslaughter after lying her way out of taking responsibility for her toddler or simply ignoring his existence until he died.

Mason's final hours were spent wrapped in a towel, lips blue, making grunting noises.

She was sentenced on Wednesday to nine years in jail and must serve at least a third before she can be released on parole.

That could be in July since she's already served more than two years in custody. But Attorney-General Yvette D'Ath is seeking advice from the Director of Public Prosecutions to see if the sentence can be appealed.