M'lady Witch
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The first book in the Heirs to the Warlock series by Christopher Stasheff, published in 1994.
From the Publisher:
"The Warlock's daughter comes of age in an enchanting new novel from Christopher Stasheff. Cordelia has inherited incredible powers from her father, and now Prince Alain has come asking for her hand. The wild young lady isn't sure she's ready to settle down . . . but forces opposed to the match intend to make sure she doesn't make it to the altar -- ever."