Mermaid at heart part one, two, and three

after Sydney leaving her peaceful place in her coral she soon reunites with Jordan at the shore. he makes them a beautiful little house made of seashells. She ends up losing her tail she treasures almost as much as she treasures him. they rescue another mermaid and her baby. Sydney and Sadie become best friends and later out in the water Sydney disappears.Does she survive out in the water .or does she go back to her peaceful place in her coral ?does she soon return with the child she was told she could never have again, Sadie cries all the way back home to tell Jordan the devastating news of Sydney being gone. Jordan walks for miles along the shore to try and find Sydney.