How State Farm determines totaled car's salvage value?

My mom hit a store and her car is now totaled.

I am just trying to help her so that she can get what is fair.
They totaled the car today. It was a Used 2005 Chevrolet Cobalt Sedan, 4cyl, and had around 215,000 miles but she used it fairly and the condition was good until this wreck.

Could anybody tell me how much should she expect?

Thanks!