A BROOKLYN mother horrifically stabbed, beat and killed her three year old because she was convinced the little girl was possessed by demons, police sources said.

"The monsters are coming from my baby. God wasn't there for her, so I had to save her," 29-year-old Brandis Nwegbo allegedly told cops.

Her child, Cathryn Nwegbo, was declared dead on arrival at Woodhull Hospital on Friday despite rescuers' attempts to save her.

After her arrest, Nwegbo was sent to Woodhull's psychiatric unit, police sources said. She has not yet been charged.

When officers arrived at Nwegbo's apartment, Cathryn was cradled in her mother's arms.

"Blood was everywhere," a law enforcement source said.