They also were convicted of rape, human trafficking for the goal of sexual exploitation, forced prostitution and producing child pornography, among other offenses.
Her partner, Christian L., was sentenced to 12 years.
Christian, 39, the boy's stepfather, must remain in preventive custody after serving his sentence.
The 48-year-old was sentenced to twelve and a half years in prison, while her partner, a 39-year-old convicted paedophile was sentenced to 12 years.
Those pedophiles paid as much as $11,500 each time they abused him, and prosecutors identified more than 50 overall acts of rape, abuse, humiliation, and bondage.
The abuse was filmed and the crimes were carried out over a two-year period.
Several men, believed to be pedophile "clients" of the couple, have also been prosecuted in connection with the case.
The stepfather has a previous conviction for paedophilia, the AFP reported.
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The boy, who was nine when the trial began in June, was repeatedly sexually abused by Spanish paedophile Javier Gonzalez Diaz.
In the following months, the court said, the woman organized assaults on a 2-year-old girl she occasionally looked after.
The trial has also raised concerns that officials might sometimes wrongly presume that a woman is incapable of abusing her own child. The verdict was based on confessions by the pair and the videos of the abuse.
Case psychiatrist, Hartmut Pleines, quoted by Spiegel news, said the mother's claim that she was in thrall to her partner when she committed the abuse, was false.
The case has shocked Germany and sparked a row over how the couple were able to sell the boy for sex for thousands of euros even though they were already on the...
Local authorities have been accused of failing to protect the boy, who now lives with a foster family, as the mother's partner was supposed to be banned from having contact with children.
Police started investigating after receiving an anonymous tip in 2017.