Frogs & French Kisses — Sarah Mlynowski

Rachel isn't a witch, like her sister, Miri, and their mom. But that doesn't mean she doesn't have a little magic up her sleeve. Au contraire--Rachel's certain that if she was the one steering the broomstick, everything would be absolutely magical.

See, instead of focusing on the real priorities-- like love potions for Rachel--Miri would rather zap up spells to save the world. And Rachel can't ask their mom for advice because she's turned into a full-blown magicaholic. What's a nonwitch to do?

Finally, all Rachel's begging persuades Miri to cast a teeny-tiny spell . . . and now the fate of absolutely everything is in Rachel's hands:

Her family.
The world.
Senior prom ...