Witchworld Series by Emma Fischel

Flo is a thoroughly modern witchgirl. She has a spellstick, travels about in her skyrider and wouldn't know a cauldron if she fell into one. But when her grandmother turns up on an actual boomstick, warning that ghouls are about to attack Witchworld, Flo realises that everything she's been told about being a witch is just hocus pocus...

The brilliant sequel to WITCHWORLD finds Flo pitched into battle with a dire creature the inhabitants of Witchworld have long thought to be mythical - the terrible Haggfiend! Armed only with Old Magic, can Flo stop the dreadful threat to Witchworld? This time Flo's on her own, with not even her batty old grandma to help her, and so battle against the scary, hairy hagg commences...

Flo is a thoroughly modern witchgirl. She has a spellstick, travels about in her skyrider and wouldn't know a cauldron if she fell into one. But when her grandmother turns up on an actual boomstick, warning that ghouls are about to attack Witchworld, Flo realises that everything she's been told about being a witch is just hocus pocus...