She has a precocious 3-year-old sister who tends to leave wet nappies at the foot of her bed, an insane cat who is prone to leg-shredding “Call of the Wild” episodes, and embarrassing parents who make her want to escape to Stonehenge and dance with the Druids. No wonder 14-year-old Georgia Nicolson laments, “Honestly, what is the point?” A Bridget Jones for the younger set, Georgia records the momentous events of her life–and they are all momentous–in her diary, which serves as a truly hilarious account of what it means to be a modern girl on the cusp of womanhood.…