Grounding Magic - Book Two of The Mermaid's Pendant oleh LeAnn Neal Reilly

After having a large family, a powerful mermaid's tail, and the magic of Mother Sea, life walking on land is, well, lonely and hard work. That's what Tamarind Wilkerson realizes after four years of marriage, a baby, and another on the way. When her husband, John, abandons her to work long hours alongside his ex-girlfriend for unscrupulous bosses, Tamarind wonders if she made the right choice to leave the waters around Culebra. Even as the new life growing in Tamarind shows signs of a grounding earth magic, the sea lures her. The question is, now that she has her happy-ever-after, can Tamarind change her mind?