Sassy with the blue eyes might be Siamese?
If so, then she'll surely want some velvet or corduroy for some soft texture. Fleece or flannel on the back of it would be ever so soft too.
Our cats love to lay on things that really contrast with their fur...it makes their beauty show more too.
Want to go all out for Sassy? Put some ribbons loops on the edges like for a baby... She'll probably play with them too.
You could also do some embroidery of fish, mice, birds etc to go with the whole kitty good life.
Enjoy and make your Mom smile with Sassy's quilt.