I would call FORD Motor Corporation and make them meet me on the lot of that dealer to let them know what sort of compensation he will be providing or risk losing his rights to sell Ford Automobiles.
Wow, the MOB mentality is really flying over there, and the "SUE THE HELL OUT OF THEM" mentality is NOT one of America's more flattering attributes. Everyone seems to hate this mentality, unless they stand to benefit...
What is the dealer supposed to do? Compensation...for what? NO HARM was done to her car.
In order to sustain some sort of legal action, a claimant MUST SHOW INJURY. What is her injury? He drove her car fast? That isn't injury to anything but her feelings.
The fact that the dealer reportedly fired the mechanic should be enough. Mechanics are LICENSED professionals, which means they are responsible for their own actions, the dealer isn't responsible for what the mechanic does, unless the mechanic did it with the dealer's knowledge and blessing, which I doubt.
I would surely have offered her a couple oil changes or something, but that compensation might be offset by the dealer being besieged by a thousand menacing phone calls from people who ARE NOT PARTY to the incident, and any unjustified and undeserved harm to the dealer's reputation. The woman should have used better judgement and handled the matter personally. If she doesn't have enough intelligence to figure out how to handle this matter without involving three million strangers, she deserves no compensation.