The Ruby Quest — Gill Vickery

Tia is determined to retrieve the DragonQueen's six stolen Jewels of Power from the High Witches. She has four of the magical jewels; now she is going after the ruby that can stop time. But that means facing the vicious High Witch Hyldi, in her corrupt, greedy town. Tia is alone, without her DragonBrother Finn, and people depending on her. Can she use all her wits and her growing witch-powers to retrieve the fifth jewel?