I’m reading Isle of the Lost by Melissa de la Cruz with my daughter who is 7 years old. She loved the made for TV movie Descendants. We have only read the introduction so far, but it seems to be, from the goodreads description, a prequel to the movie. We also had to get the soundtrack for this for our daughter and she has some of the dolls as well.
That seems to be what happens when she sees a movie that she likes. She wants the dolls and soundtrack. I’m really happy that with this movie there are follow-up or prequel books to read with her.