I wouldn't fix it. I'd frame it instead.
If you fixed it, in
my opinion, it wouldn't be the same quilt, and she'd keep using it, which would mean more wear & tear.
Here are some cute framing ideas.
https://www.pinterest.com/search/pin...yped&term_meta[]=framing%7Ctyped&term_meta[]=old%7Ctyped&term_meta[]=quilt%7Ctyped
This one is my favorite.
https://www.pinterest.com/pin/210332245074227403/