Jody Simpson was recalled to prison after breaking her strict licence conditions by having “a relationship with a convicted sex offender”.
Simpson, 30, and partner Anthony Smith got ten years in 2018 for torturing six-week-old Tony who had multiple injuries, organ failure and sepsis.
She was released last February but Tony’s adoptive mum Paula, 56, was notified last week she was back inside.
She said: “The fact she’s been having a relationship with a convicted sex offender is shocking.
“It proves she’s still a risk to society and belongs behind bars.”
Paula, from West Malling, Kent, said that when she broke the news to Tony, now nine, he said: “Good, that’s where she needs to be.”
Paula hopes Simpson’s jail return will quash any new parole plea.
HM Prison and Probation Service said: “We don’t hesitate to recall offenders to custody if they break the rules.”