Why is this woman a look-alike of one of the president's daughters?

Set in a beautiful island country in Italy, Bianca Lucchese and her husband Joe work hard at their veterinarian practice, raise their kids and keep their marriage vibrant. But two interfering mothers bring them to the brink of separation. When Bianca meets Andraya Manwaring, her life falls apart and Joe isn't there for her. He's left her at the worst possible time in her life—when she discovers she's the long-lost daughter of a US president.