Honor Roarty, 21, had not been handcuffed when placed into the rear of the squad car and was at large for nearly 24 hours before handing herself into police.
The nightclub promotor had got into a heated row in a Caterham park with Hannah Andrew then damaged the vehicle she spotted her rival travelling in shortly afterwards.
She pleaded guilty to escaping lawful custody and causing criminal damage to the car on July 27, last year.
Kingston-upon-Thames Crown Court heard Roarty has a "history" with Andrew and there was a heated exchange of words between the pair.
Later, after a trip to a local tanning salon, Andrew was a passenger in a car driven by friend Sophie Brett and they spotted Roarty and a male walking towards them at 6.10pm.
They "heard a loud bang" as Roarty passed by and Andrew junped out and fled the scene.
Her friend Sophie drove away feeling "a little scared" and called the police when she saw a number of small dents and scratches to her car, which cost £240 to repair.
Officers had Roarty's description and arrested her the same day, but while sitting in the rear of the police car she wound down the window, jumped out and escaped at around 6.50pm.
She handed herself into police before 3pm the next day.
Roarty was placed on a twelve-month community order, which includes 40 hours community service and must pay £240 compensation and an £85 victim surcharge.