The Marmawell Trilogy Series by Martine Bates, Martine Leavitt

When news of dragon trouble comes, Marwen doesn't scoff even though dragons haven't flown in the land of Ve for many generations. Her destiny has been woven, and it will lead her to lost lands, to the powerful magic of the Wizard's staff and to a mystery no one should have to face alone.

The word is out upon the land: Marwen has vanquished the dragon and finds herself heir to the Wizard's staff. But her transformation is not yet complete, and the staff is not yet hers. And danger lurks closer than ever as the staff is sought by another who holds the dreaded power of the Prism Moon.

An evil sorcery prowls the land. The Oldwives are losing their magic, and an ill wind weakens the hiding spell that protects them. Worse still, Marwen is powerless to stop any of it. She must find the Key, the powerful talisman woven into her tapestry. In the deathlands Marwen and the Oldwives must travel to solve its mystery.