Mother Wants To Sue Me For Car.

Hello everyone! About two years ago my mother gave me money to pay for a car, roughly 10,000. (Just FYI, did not want an expensive car but at the time she wouldn't give me the money if I didn't get what she considered a "newer" car) and my dad and myself put in money aswell. My parents are divorced and my relationship with my mother has been deteriorating since then to the point where it's practically non existent. She has been saying for the last couple months she is going to "take her car back" that she bought. However, she just sent me the money the father bought the car so it was his name initially before being transferred over to me. Do I have to be concerned over this? Her suing me for the car or the money she gave me? I got a new phone so I don't have any documentation of our conversations, but she sent the money willingly.