I would sew a log cabin in the Barn Raising pattern and call it a day. It makes a nice big diamond. Beggars can't be choosers. And since you already know that she is a glass-half-empty gal, you for sure know that no matter what you do, she will find some way to be disappointed. It's her way.
Make the quilt so you are pleased with it, send it off to her, and know that you did a good thing. Don't hold your breath looking for applause from her, but please post pix here so that we can all congratulate you. I know it will look great!