Thanks but neither of those is what she's looking for--the fabric she has needs to be the focus, as the print is in the pictures I've seen of Puzzle Boxes. Those others are very easy, but have too many distracting other fabrics.
The fabric she has would be great for Attic Windows but she's not interested in something that complex. Puzzle Boxes implies it's simple piecing...but looks like it has set in seams in the corners.