Let your MIL shop from your stash. make a lap size quilt or a Nap size that is about 65 x75. Remenber that you are making this for your DH's grandmother not only your MIL's mother. Make this lut of the kindness of you heart! Try to keep it as cheap as possible since you said that your MIL does not have a lot of money. Also even though someone may not be able to recogonize you or acknowledge that you are there they know when some one that loves them is near. the quilt made with love will comfort her.