Anyone can write a story based on the kind of horror where you see a guy in car and then there's the bad guy in the back seat. It's infantile to rely on that for telling a story. That's like going to bed and thinking there's a monster under your bed. It's silly. ↗
The object is very clear in the fight against racism; you have reasons why you're opposed to it. But when you're writing a novel, you don't want the reader to come out of it voting yes or no to some question. Life is more complicated than that. ↗
I don't know if she should worry too much, I mean some of our greatest writers have had movies made of their books, lots of Hemingway novels were turned into movies, it doesn't hurt the book. ↗