I don't understand why they aren't going after the dead guy's insurance. He's the one who was at fault, not the owner of the car, so his insurance should be the one to pay for the injuries.
If the person didn't have their own car, I would be surprised if they had their own car insurance. The victims could sue the estate, but there might not be a lot of money in it.
Either the owner pay as if she wasn't doing a business, or the dead guy's pay as if he was driving a rental. Mine is pretty basic and i can pay my deductible for rentals.