Authorities said Marion Zock was parking her Ford Fusion on Thursday outside Classic Hair Design in Kent County's Plainfield Township, near Grand Rapids, when she stepped on the accelerator instead of the brake.
Two people were injured, including an employee who returned to work after treatment and a girl with a bruised arm.
Zock told WOOD-TV her foot slipped from the brake. She's a regular customer and says she was "so embarrassed."
Stylist Kristi Dochod told WWMT-TV the crash sounded like an explosion. The salon stayed open as the car was removed, and is open during repairs.