You are in for a major task. If you had not given some background I would have said it is not worth repairing. Do you know why others have declined doing the work. Do you know her expectations for the repair. Are you able to meet those expectations. I urge you do some heavy research on repairing old quilts before making a commitment. Emotions can develop if the owner expects a "like new" repaired quilt and it doesn't happen. Personally I would not take on the work it appears to require.