Mercedes Lackey 
Home from the Sea 

Mari Prothero turns sixteen, and learns the family fishing luck depends on each generation marrying a sea-dweller, but she demands her choice of suitors and a teacher from the sea ruler. In London, the stuffy official magicians send a pair of friends to seek the new water mage, little knowing the three girls would become best friends.

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Mercedes Lackey is the New York Times bestselling American fantasy author behind the Heralds of Valdemar series, The Elemental Masters series, the 100 Kingdoms series, and many more. She has published over 100 novels in under 25 years.