The woman whose car ran down a Bloomberg-administration staffer and her pal in a weekend hit-and-run in Brooklyn insisted yesterday that it was her sister who was behind the wheel.

“It was not me,” Cindy Jasmin said. “My sister was the driver of the car involved in the accident.”

Prosecutors have said they are unsure who was driving of Jasmin’s Acura early Sunday morning when it struck Erinn Phelan, 22, a coordinator with the mayor volunteer agency, and Alma Guerrero in Prospect Heights.

Jasmin’s sister, Frances, 28, was so distraught after the crash that she checked into a psychiatric facility and is under 24-hour suicide watch, said the sisters’ lawyer, Adam Thompson.

Investigators have been unable to question Frances, but Thompson said he was trying to negotiate a sit-down after his client was released.