Before we find out about Suzanne's crime, we get a taste of her upbringing. She was adopted by a white, suburban couple, and despite loving her daughter, Suzanne's mother often pushed her to accomplish more than she was comfortable with — like singing a song at her graduation.
A season four flashback reveals that Suzanne used to work as a greeter at a superstore. One day, she sees a kid whose family she knows from the store at the park, and she brings him home to play video games with her. After a while, he wants to go home, but she doesn't understand. He tries to use the fire escape to leave, but falls — presumably to his death. It's one of the darkest backstories we've seen on the show.