Q/M: It is hard for me to picture the options without seeing the fabric but I would go for the way that allows you to tame the wobbles with the least unsewing. Additionally I would try to come closest to the idea your Mom was working toward. As I age I hope I never have to give up my favorite pass time, love that she was trying to finish that one last quilt. So new saying, "Quilters never give up, they just loose their 1/4 inch".