Haruna was a hostess in a cabaret club, but she quit when she fell in love with her boss, Shinohara. They got married, had a daughter, and their life is happy and full of love. However, Shinohara is still in charge of the cabaret club, and Haruna is getting jealous of his friendly relationship with a popular cabaret girl, Kyoko. Partially to monitor her husband, and partially as an effort to prove that she's better than Kyoko, Haruna has decided to revive her cabaret girl career!

Of course, her being married and having a child have to be kept secret from everyone in the club and the customers!

source: https://www.mangaupdates.com/series/41u1jrw/mama-wa-kyabajou