GO to the court, file a suit. Obtain an order (injunction) preventing her from selling the vehicle and then in the petition also seek relief that she sell the property and share the proceeds. Move quickly before she sells the property and get a lawyer. You can ask the judge to require that she repay your attorney fees.
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It may cost you thousands of dollars, but you can take her to court and attempt to persuade the court to divide the car (probably by selling it).
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