She told Collider that she had initially been attracted to the show by the quality of the pilot script.
"I thought it was phenomenal and so interesting," she said. "After reading the script, I wanted to be a part of it. I thought it was really, really funny."
The Oscar-nominated actress insisted that despite the dark subject matter of Precious, she had not been actively searching for a comedy project to star in.
"It wasn’t necessarily a decision to do some comedy," she explained. "I don’t think about what the next step is that I should do. I just think about the work and how it makes me feel."
Sidibe previously revealed that her character Andrea is "sassy and colourful".