Lotsa luck - Diana G Gallagher

Sabrina's down on her luck, just when she needs it most...until she finds a magic spell that promises to change her old rabbit's foot into a real lucky charm. Suddenly, everything's going her way! Now she'll be able to ace her history test, find someone to help out with the class rummage sale, and maybe even win the football tournament at the Slicery, all in one lucky day.
But Sabrina is tempting fate. She forgot to read the small print in
the spell book, and now she'll have to pay the price. She's slamming her hand in her locker, getting into trouble at school and fighting with Harvey, all thanks to the unlucky charm. Sabrina's got to deactivate the charm - before her luck runs out!