What utter *beep*
The movie AND the book series. For starters, let's deal with the description alone. Culture is not inherited genetically - The fact that Katie is adopted is not an explanation for why she would feel "disconnected" from her culture. If that's the case, I can't wait until Angelina Jolie's daughter Zahara decides to give up her luxurious lifestyle and go to live as a rural Ethiopian subsistence farmer.
This series is the creation of an evangelical with a flawed and biased perspective of the Amish, and I hope her ethnocentric romanticism isn't being taken as an accurate understanding of the Amish way of life by viewers and readers.