Perhaps pile B should read - cut 4 strips 3" and cut 2 - 15.5" pieces = 8
and pile C should read - cut 2 strips 4" and then cut 4 - 9.5" pieces = 8
seems she has got her 2s & 4s a bit muddled. but without seeing any pic of the quilt that's only a guess. I would be inclined to send her an email and state the problem.
I was surprised that I couldn't find anything about this ladys' quilts. She has a website, but only seems to have links to others' sites and nothing about her own, except a few tutes.