Since the backing is still in place, I contemplated just cutting it 1/4" larger than the quilt top and then folding it under to match the edge and whip stitch it in place. But I couldn't figure out how to deal with the inside corners of the hexagons. And as I examined the quilt closer, there were places where the backing was actually smaller than the quilt top. Can you see the pink quilt top peeking through the batting below?
I thought about packing it all up and giving it back to my friend, but I just couldn't disappoint her. I looked at lots of photos on the Internet and saw that lots of people just whacked off the edges and made straight lines, but I just couldn't do that either. It sort of spoiled the look of the quilt for me.