How does Mother Courage feel about her daughter, Kattrin in the play, Mother Courage and Her Children?

Mother Courage compares Kattrin to her other children. She calls Eilif "brave" and although she calls Swiss Cheese "stupid", she calls Kattrin "nothing". To Mother Courage, she has neither a positive or negative opinion of her daughter: she is ambivalent. She also sees Kattrin's muteness, which some might view as a disability, as a "mercy", clearly expressing her thankfulness that she doesn't have to hear her daughter speak.