What was she doing with the titles at all? You KNOW who took it it's time to go to the cops shop and sign a complaint.
Also easy to verify the titles were transferred. Is this YOUR CAR? That is are YOU the sole person on the title as owner? Then go to the DMV and file for "lost titles" and if it comes back transferred, etc then that is your answer. This is likely felony fraud / forgery of some sort on top of theft