I'm not seeing anything that would negate the fact that the car, in equity, was yours, due to your legitimate purchase (which you should be prepared to prove) from the seller (perhaps get a signed notarized affidavit from him confirming same); failure to register the car after a certain amount of time can be an infraction, but that does not negate the fact that the car belonged to you and you could sell it. It also does not equate with fraud. If she is denying that the car was sold "as is", provide the Bill of Sale with all of the As Is language and other necessaries.
If you are missing that Bill of Sale and think that she will be able to show that is was not "as is" in her mind, and that you may lose this case - you do not have to continue the case - you can simply settle with her, either for what she want/demands, or something less.
Hope this helps to clarify.
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