Mama scolded Sonny only the one time about interfering, during the dinner after Vito's return from the hospital.

While she did play a more prominent role in the novel...I don't think there was much they could've done with her onscreen without bogging down the film. I think FFC was extremely wise to omit that whole Kay-visiting-Mama business. It just wouldn't have played well in the movie.

I do like that deleted scene where she's cooking and Santino informs her of Vito's shooting...but again, that wasn't necessary to the story in the final cut.

Apple