Gift of the Unmage. Worldweavers, #1

"Who knew you'd be a true weaver?" Great things were expected. Thea Winthrop, Double Seventh, the seventh child of two seventh children, was the very definition of magic, greatly anticipated, and in whom much potential rested. But something was very wrong. It wasn't that she did magic badly - it was just that she couldn't seem to do any magic at all. The most magical creature alive... turned into the Girl WHo Couldn't. It was not until a last-ditch effort to wake up that absent magic, sent into the past to find a glimmer of a new and unique magical identity, that Thea's world begins to change, and she learns that her greatest strength might be the powers that she had yet to discover.