Uuuuuhhhhhhmmmmm. That was me not wanting to choose. But since I must, my absolute favorite female author is Natalie Lloyd.
You can follow her blog over here and I recommend that you do. I've read both of her books, Want More? Life and Paperdoll and they are both outstanding. Some people are just gifted at stringing words together in a way that makes you think or sigh or dream or want to write something of your own. And she is one of them. I admire her passion, her gift, and her love for God, and think that she is an incredible writer.