The girl and the attackers got into her car and drove away, leaving the victim bleeding on the ground, police said.
Police say a 19-year-old in New Jersey lured her ex-boyfriend to a schoolyard where he was robbed and beaten while she looked on.
Police in Wyckoff charged Margaux Tocci with robbery and theft.
Police say Tocci and her 19-year-old former boyfriend were approached Thursday night by two males who beat the ex-boyfriend with a baseball bat and pipe.
Police tell The Record newspaper Tocci and the attackers got into her car and drove away, leaving the victim bleeding on the ground.
He was treated for head injuries.
Tocci was arrested early today and police are looking for the other suspects.
