I have been making a "nap" size quilt that usually measures 63 x 75 give or take an inch. You might want to add 2 row across and 2 row down to make it about 48x66 with out border and then add 4-6 in border making finished size 60 x78. You could also add sashing between 4 blocks making 12 x12 blocks out of 4 squares. Any size that you make will keep her warm with you love and kindness!