I'm curious what you think a 1995 Camery is actually worth?
Every dealer I know will tell you that KBB is a wonderful tool. It is also rarely a true indicator of the actual value of a vehicle for any specific market. So it is a given that Geico tried to get over on this lady. Why would they offer $4200 if the vehicle was only worth $1700. The market value of a fuel efficient, well maintained, very low mileage, rust free, highly sought after 1995 Camry would be what ever the market would bear. $4,000 to $5,000 would not be unreasonable. The closer you are to a large city the higher the value of said car. They are great commuters and get about 30mpg highway all day long. That car could easily go another 100,000 miles without major problems.
Yes their reply once caught was probably close to the actual FAIR market value of the car. But as pointed out, that valuation of the car would not have resulted in the car being totaled. So other than the initial scam they were perpetrating, what are they trying to hide. Why the push to get a quick decision and sweep it under the rug? After all, you apparently think they are offering $2500 more than the car is worth.