I had some old quilts that my g'ma made and they were tattered and torn because they had been used.
Knowing why she wants it repaired is important info. If it is just to salvage something gma made, options are different.
I bought a pattern for a stuffed bear and i cut up the old quilts from my grandma and gave the bears to my mom and each of her brothers (4 of them). Each bear has a tag on it w/ the story and the request to pass the bear down to future generations. Actually, the tattered quilts worked really well in the stuffed bears.