It appears from your post that your sister is on the title and that you did not have a written financing agreement. But you do not write whether she left anything else. If she did not, you may be able to file a DMV Affidavit of Heirship. If she did, you may need to probate (settle) her estate through the court. The estate can offer the car to the lender (you) or, if the lender refuses, pay off the loan. The change in market value is relevant to your decision as the lender.
This is general information. It cannot substitute for a personal consultation with an attorney. It is not intended to be legal advice or imply an attorney-client relationship.
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