Hi Anael
I have that book also and her fabric requirements are fairly spot on. I always purchase more that is required as I "might" make a mistake. I have found that the more pieces in a quilt the more fabric required, its all those pesky seam allowances
With her pattern Out of the Darkness she gives the entire fabric requirements for the whole quilt and also the requirements for each individual block. The only down side for me is that if you are making one of her quilts like the one above you have to have the entire quilt cut before you start sewing, and I really like to cut a little sew a little cut a bit more sew a bit more.
Will take a pic of the blocks I have made so far and post them for you,
Be right back