Suffolk County Police say Jessica Pistolese was behind of the wheel of a 2004 Chevy Malibu that crashed into another car on the Montauk Highway Saturday afternoon.
They say Pistolese's mother Judith Rivera was in the front passenger seat of the car.
They say Rivera was pronounced dead by the medical examiner's office.
The 38-year-old Pistolese and the driver of the other car were treated and released from a local hospital for non-life-threatening injuries.
Pistolese was released on bail and given a desk appearance ticket. Her next court date is Nov. 4.