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Co-signer deceased
People act like lawsuits are the end of the world, her suing shouldn't be considered a threat, it should be considered the accurate course of action to resolve contractual obligations. Of course, it would be convenient if she did nothing at all!  If you believe her real goal is to "get it off her credit", then have her come refinance with you. This will give you the opportunity to not have her on it and you to get different terms. Of course, if your credit still is poor then this option also exacerbates the inconvenience. None of the options sounds like they will ruin your credit (unless you are scrounging for cash through credit facilities to pay her off). You have several completely benign options available.