what's maman's human emotion in the story?

I'm not sure what you mean by her human emotion. Maman dies at the story's beginning and references to her ultimately deal with her son's inability to really love her.... and the lessons she taught. Mersault clearly remembers his mother's teachings while in prison. It seems her words are most clearly realized through anecdotes. Her words help him through.... almost as if she's there. Thus, if I had to attribute a specific emotion, it would be motherly love.