Veronica Panarello strangled her son Loris Stival with electrical cables then abandoned his body in a remote gully in Santa Croce, Sicily, Metro UK reported.
She thereafter lied to the police that the boy had been kidnapped.
She said she had taken Stival to school but was not seen as for the time she went back to get him in the afternoon.
Prosecutors branded her an ‘egocentric, manipulative liar.’
Even after she had been found guilty of Loris’ murder and received the sentence, she continued to deny the act.
She also blamed the husband’s father, Andrea Stival, When she confessed that her son had been killed in November 2014.
She told an earlier hearing that he had helped to plot and then carried out the murder because Loris had caught them having sex.
Stival is being investigated as an accessory to murder, according to Italian media.
He has denied the claim and is threatening to sue his daughter-in-law for slander, it has emerged.
Her husband has now filed for divorce.