 Mann is known for her role as Cora Simmons in Tyler Perry's plays, including "I Can Do Bad All By Myself", "Diary of a Mad Black Woman", "Madea's Family Reunion", "Madea's Class Reunion", "Meet the Browns", and "What's Done in the Dark".Mann has appeared in movies including Madea Goes to Jail and "Madea's Big Happy Family".She recorded some songs on the soundtrack for "Diary of a Mad Black Woman", including participating in the song "Father (Can You Hear Me)".