You can see a handwritten copy of Nancy's pattern here.
You can download a 6" version of this applique pattern here.
There are several antique Friendship Dahlia quilts at the Quilt Index.
Here's an example of a Friendship Dahlia quilt at Ann Quilts. This one has sashing which is different from Nancy Cabot's pattern that calls for the blocks to be set together "block to block" with a 4" border on all sides. Notice that all of the petals on each flower are made from the same fabric but each flower is a different fabric. I wonder if friends donated fabrics to the maker of this quilt?