Debby Hunt had been driving past Dennetts on Warwick Road on Sunday when she noticed police surrounding the store, and a black Seat Leon protruding from the broken front window.
“It was horrendous,” said the 31-year-old, who runs the shop with her brother John Coulles and father Andrew.
“At first I thought we’d been ram-raided. There was glass everywhere, furniture damaged and a chair from the window had been catapulted across the shop.
“It’s exceptionally lucky that it didn’t happen during the day when people were in the shop. There would have been some serious injuries.
“I had a lovely day planned for Mother’s Day. Instead I spent the whole day sweeping glass.”
The owner of the car involved in the crash fled the scene and police have not yet been able to track them down.
Debby estimated the damage would cost around £20,000 to repair but said the family were determined not to let the crash affect the shop, opening for business as usual the following day, despite the front of the premises having to be boarded up.
“Dennetts has been here for 100 years, we have the fourth generation working in the same shop,” she added.
“Nothing like this has ever happened before.
“We’re all upset, the front of the shop has been totally ruined. It will take weeks before it can be repaired but we’ll carry on.”
A West Midlands Police spokesman said: “The incident was reported to officers at approximately 6.20am.
“Officers attended and the vehicle was removed a short while later and the property securely boarded up.
“No arrests have been made at this stage and no property is believed to have been stolen.”