Before I had my dogs I lived in the Bay Area. Nowhere is safe to leave a dog in a car unattended. I think of my dogs as my children. Sadly people leave kids in cars alone all the time.
it is IMHO very irresponsible to leave your precious dog in your car to go shopping in the mall. it was all to inviting for someone to steal her yorkie. A extremely painful lesson to learn the hard way. I do wish the safe return of her dog, however it may be unlikely.