How wonderful to have this mother-daughter time together. :)
One fun thing to add to a quilt, that I have done before, is find a shirt,or some special article of clothing that can be cut into a simple square. Add this square to your quilt. It adds a special touch and memories.
Even a square of her "Blankie" that she was fond of during her "earlier" days.
A tee shirt may also be used, by ironing a piece of fusible NON-woven interfacing, that is machine washable. I use the interfacing for light to med. weight fabrics.
Just cut the fabric and interfacing larger then is needed, iron on the interfacing according to directions. Once completed you can cut this piece to the correct size needed for your quilt square(s).
Happy Quilting!!
Corinne