The car met with the accident whereas the owner initially suppressed the facts material to purchase the vehicle.
This itself clearly indicates the act of heating.
Now about the compensation?
As the car met with an accident, there should be a case registered with the police, hence did you enquire about the pending police case, as to whether the case is still pending or disposed and the details of the case/FIR.
You cannot transfer the car to your name if the hypo loan has not been discharged by the owner.
Besides you will be unnecessarily called to the police station if there is any case pending.
You may better ask the lady to return the purchase money and take back the car instead of fighting with her for the compensation of paltry amount and suffer with the problematic car forever.
You can issue a legal notice to her if she is not answering your calls .
After that you can initiate legal action through court on further issues.