I watched the same as you did, I followed her exact instructions, I have a problem with the corners, I will work on that though, but she said when you sew the binding on from the front to follow the same stitching from the back side, if that makes sence, I did that and my stitching landed on the binding on the back side, I would send a pic but the quilt is dark so would be hard to see....
I used 2 1/2" binding and am new to this, but by doing it the way Leah Day explains does not leave the binding "full"...