When my mom got "saved" and heavily came into religion she gave up Daniele Steele novels because how "trashy" they were. Yet she's reading this book. When I called her on it she said it was an "interesting look into the male psyche"
and not like the "trash" she gave up.
She's your mom. Let her read whatever she wants.
I still can't believe the main characters are named Anastasia Steele and Christian Grey. I thought people were joking anout that at first.