Thanks for your request for a Book Match. This happens to be one of my favorite books, too. If you like this one, you might enjoy other books by Kevin Henkes. Lilly is also a character in "Julius, The Baby Of The World" (Lilly is convinced that the arrival of her new baby brother is the worst thing that has happened in their house, until Cousin Garland comes to visit.). Another character he writes about is Wemberley. Try "Wemberley Worried" (A mouse named Wemberly, who worries about everything, finds that she has a whole list of things to worry about when she faces the first day of nursery school.)
If you like girls with lots of spunk, like Lilly, you might also like "Brave Irene" by William Steig (Plucky Irene, a dressmaker's daughter, braves a fierce snowstorm to deliver a new gown to the duchess in time for the ball.).
Caroline S. Parr