I know next to nothing about the adaptation, but I feel like they probably toned down the "incest is sometimes just how it is" elements from Flowers in the Attic and played up the rape scene instead.

Because its been decades of feminists trying to reclaim it, because it has a "strong" female protag, most major characters are female and written by a female. But the majority of it is women doing awful horrible things to one another, including cucking, gold digging, and destroying lives for their lust.