I'll be keeping an eye on it but 18 yards seems like a ridiculous amount of fabric for a (if my iffy math is correct) 5 foot by 5 foot finished quilt (it's apparently going to be 10-6 inch finished squares by 10-6 inch finished squares) Maybe she meant you should use 1 half-yard bundle/2 fat quarter bundles to have a decent variety of fabrics to choose from, and you wouldn't be using them all?