If my mom stole my car and it was a gift four years ago, can I do anything?

My guess is your mom is title holder, which gives her apparent authority to sell the car. Depending on what the car is worth, you'll need to request an injunction in either District Court or Circuit Court, asking that the sale be stopped. If you choose that route, you really need to get a lawyer. Alternatively, you may just have to sue her for the value of the car. Again, which court you sue in depends on how much the car is worth. If it's within the amount for Small Claims Court, you may be able to sue there without a lawyer. However, you probably will want to consult a lawyer on this no matter which way you go. Good luck.