Legal Question in Family Law in Maryland

As co-owners you each have a right to use and possession of the vehicle. I'm not sure what you mean by "coapplicant". Of course, your mother may be paying for the insurance and she could drop your coverage, and she may be paying the financing. She could also force you out of the house if you are living with her. So I suggest you try and work things out, because you're still dependent on her.