ANA Julia Quezada has confessed to murdering Gabriel Cruz.
It comes after she was arrested on Sunday when police found the body of the young boy, also known as Gabriel Ruiz, in the boot of her car.
The expat, from the Dominican Republic, says she hit the boy too hard during an argument.
Her lawyer Beatriz Gamez says the suspect is now cooperating with police and has given a one and a half hour’s statement.
The Guardia Civil arrested her as she was transporting the corpse of the small boy in the trunk of her car on Sunday.
As she was arrested she shouted out: “It wasn’t me. I only got the car this morning.”
She was told in turn to ‘shut up’ by a policeman.
The investigation continues.