It is after all, her quilt and made the best she could considering her condition. Finish it as is and maybe just repair or reinforce any frayed or open seams. If thy are good then just get it quilted with lots of quilting to help camoflage any "imperfections". IMHO, this quilt has no flaws at all. It was made with all the talent and love that could be given to it and I would love it dearly.
Finish it as is. I hope I make it as far as 90, and can still quilt, even with "flaws".
peace