Vivian French 
Stargirl Academy 6: Olivia’s Twinkling Spell [PDF ebook] 

The girls in Team Starlight learn spells and earn their stars in this magical new young fiction series!Welcome to Stargirl Academy, the magical school in the clouds! Previously a rather old-fashioned establishment, it has been reopened by its head teacher to train children to be modern day fairy godmothers. Fairy Mary Mc Bee selects a group of girls: Lily, Ava, Madison, Sophie, Emma, Olivia – and Melody and Jackson who think they’re better than everyone else. The girls learn lots of spells – shimmering, starry, shining, sparkling, glittering and twinkling ones – which they use to fix problems and help people in trouble. For every successful mission they gain a star, and once they have six stars they will be fully qualified stargirls!