Every ambitious woman who's trying to change the world needs good girlfriends. The kind that you're vulnerable enough with to share your dream of publishing a book. The kind that tell you when you say you don't have time to write one: "I think chapter one should be about why women don't have time to write books." You need the kind of girlfriends who give up their bed and make you breakfast every morning when you're on the hometown leg of your book tour. The kind who plan events where your book sells out. The kind who you call in tears when you don't make the NYT Bestseller list the first week your book launches. The kind who gently remind you that your book is about releasing unrealistic expectations. These are the kind of girlfriends who have made me who I am. This week, they were my backbone.