Legal Question in Credit and Debt Law in Florida

Unless you have a written agreement that provides that you retain a security interest in the car, no, you can't. As I read your question, the car is registered in her name. It's her car. She has the car, and you are stuck with the payments. If you stop paying, its probable the car will be repossessed, but you will be stuck with the deficiency balance. You should probably see an attorney about the viability of a lawsuit against her to recover money owed.

You have now learned why you never, never, never do such a thing. The car is hers. If you have some paperwork, some e-mails, something about the deal you may be able to recover the car after executing on a judgment. But, you will definitely need to see a lawyer. I would try to first work it out with her. If she can't pay, see if you can get her to transfer the car to you. Fingers crossed.