The Brooklyn mom who allegedly insisted her long-missing 11-year-old autistic son did not exist was released from Rikers Island this week after her lawyers argued for her Fifth Amendment rights, law enforcement sources said.

Jacqueline Pritchett, 50, was cut loose Tuesday from the notorious city jail complex where she’d been held since October on a family court warrant for allegedly refusing to answer questions about her son, Jacob Pritchett.

Her attorney invoked her right to protect herself from self-incrimination, the sources said.

The Brooklyn mom who allegedly insisted her long-missing 11-year-old autistic son did not exist was released from Rikers Island this week after her lawyers argued for her Fifth Amendment rights, law enforcement sources said. DCPI

Jacob was nowhere to be found in late September and early October when child welfare officials – and later police – swept the Howard Avenue home where he was believed to have lived with his mom, the sources said.

Jacqueline Pritchett allegedly flew into a rage during one NYPD visit and claimed she lived alone with no children, according to the sources.

Jacob was nowhere to be found in late September and early October when child welfare officials.

Detectives ultimately brought a K9 dog into the apartment, which detected traces of human blood in or around the refrigerator, the sources said.

But investigators found no signs of the boy — who neighbors claimed hadn’t been seen for about two months, cops and sources said.

Following that visit, Jacqueline was taken to the hospital, where she was considered an “emotionally disturbed person,” the sources said.

About a week later, the NYPD swept the High Acres Landfill in Fairport, Western New York – more than 300 miles from the Brownsville home – for any signs of the boy, according to WHAM.

Jacqueline Pritchett allegedly flew into a rage during one NYPD visit and claimed she lived alone with no children, according to the sources. Kyle Mazza/Shutterstock

And in late October, police released a computer-generated image that predicted what Jacob would look like today.

Jacqueline Pritchett was nowhere to be found during The Post’s visit on Wednesday.

But urgent letters had posted on her apartment door, ordering Pritchett to vacate the premises and noting that the landlord would be removing the items inside and changing the locks on Thursday.

The NYPD said Thursday that there were no updates on the investigation into Jacob’s whereabouts.