Seasons of the Heart — Jo Ann Brown

From Book 1: The Prodigal Daughter Returns 

Ten years ago, Amish quiltmaker Leah Beiler and her twin brother left their community and family without a word. Now she's finally come home -- with her orphaned young niece. Leah has much to explain to so many, including Ezra Stoltzfus. Before she left, she dreamed of marrying the handsome dairy farmer. But now that she's lived among the English and is raising a child who knows nothing of Amish ways, Ezra worries she'll leave again. Leah will have to prove to Ezra that her future is in Paradise Springs -- and with him -- forever.