A great deal has been written about Kate Greenaway.
My primary source for this blog entry was an early one, the 1905 book Kate Greenaway written by her friends M.H. Spielmann and G.S. Layard shortly after her death.
Many copies of Greenaway's books exist online. One source is illuminated-books.com which has a copy of Spielman and Layard's biography.
Another is the Baldwin Library of Historical Children's Literature at the University of Florida. Just search for Kate Greenaway.