Can you prove that you have given her the payments? Do you have anything in writing (sales contract, etc.)? You can sue her in small claims court for a breach of the contract if you can prove that she wrongfully repossessed the vehicle. You will need to be able to prove your case, though.
The answers to these questions may be different depending on your individual circumstance and should not be considered as legal advice or the establishment of an attorney-client relationship.
A Court can sort this out. Your chances of success really depend on the facts of payment, how and why it was repossessed, who repossessed it and the contract.
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