start with a table topper or mug rug or wall hanging or even a quilted pillow. smaller is better so sense of accomlishment is immediate. Rail fence is the easiest one I know of and you just need 3 fabrics. Pardon my inability to recall the name but you can make a quilt like a brick wall with rectangles or squares. This way, she doesn't have to match up the seams perfectly.
Once she gets going, if you see her regularly, you could do a sampler quilt. She could do just one block each time she sees you. No pressure for them all to look exactly alike. You can use scraps. Have fun.