Dannah Gresh & Suzy Weibel 
T is for Antonia [EPUB ebook] 

Toni Diaz has a major problem. She’s faster, stronger, and taller than most of the boys in her 6th grade class. Doesn’t sound like a problem? Think again! She can’t understand why God made her both the best athlete in her class and a girl! She wants to play for the Rutherford B. Hayes middle school football team, but school rules. . . and her parents. . . won’t allow it. Toni decides to do it anyway. When dressing like a boy to pose for tryouts lands her in detention, she meets the founder of the Secret Keeper Girl Club. The club’s crazy assignments help her learn that the coolest person she can be is. . . herself!