Maybe the maker designed the pattern herself and isn't ready to share it. I design most of my quilts and I'm willing to share some, but not all. If you can figure it out yourself I'm happy to share it so that you don't have to go to the trouble. If it's something complicated that I put a lot of time and effort into I'd rather keep my pattern to myself until I've made as many as I'm going to make. And then I'd have to go to the trouble of patterning the quilt.