I'd ask her where she got it, and ask her on a scale of 1-10 how much it means to her. If from a yard sale, probably her rating will be very, very low and you also will know it's of little worth to her. What IF you went to a lot of trouble and then she decided she didn't want it? Or she used it as a dog bed? If, on the other hand, it's of great value (9 or 10 on the sentimental scale) ask her if she'd be willing to pay you xxx dollars to repair it. Chances are, if you throw her a high estimate, you'll be able to gauge her seriousness about the job. I have found so much freedom in just saying "no, it's not something I (enjoy) or (feel qualified) or (have time) for."