Sir Fig Newton and the science of persistence

Eleven-year-old Miranium's summer is going down hill fast: her best friend, Thomas, has moved away, her know-it-all nemesis, Tamika, has moved too near for comfort, her parents are stressed since her father has lost his job, she has just blown up the microwave with an ill advised experiment (destroying her own cellphone in the process), and worst of all her beloved cat, Sir Fig Newton, has developed diabetes; there is no money for his medical care, and her parents want to re-home him--but Mira is determined to raise the money somehow even if it means turning to Tamika for help.